Power Bank PCB PCB

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What Are The Major Types Of Power Bank PCB?

Versatile power bank PCBs are used in growing the power management mechanism of electronic applications. These power bank boards are Trustworthy to boost your business to a great extent.

1.High capacity PCB
2.Low capacity PCB
3.Power bank wireless PCB
4.Power bank speaker PCB
5.Blue Tooth headphone power bank module PCB
6.Portable power bank PCB.

Major Types Of Power Bank PCB
USB Port

Which USB Port Is Suitable For A Power Bank PCB?

USB-C port is the most of effective universal serial acpects used in power bank PCBs. Among with a lot types of USB connectors, USB-C offers a better performance in many ways.

This USB is a lttle bit larger than micro USB connectors.

But the size is smaller than standard USB connectors. So you can use it in high-density PCB works This property increased its use in power bank circuit boards.

How Does A Power Bank PCB Module Work?

The power bank PCB module offers tremendous support to the portable power stations.

The working proceed is highly effective for device charging. In general, a power bank contains the following parts:
1.A charge controller
2.Boost converter

This PCB superbly controls the functionalities of these three aspects.The charger is controller acts to regulate the charging state concerning the voltage supply.

Power Bank PCB Module Work

Venture is a manufacturer and a PCB solutions provider. We have an extensive range of high-quality PCBs and other types of PCBs such as PCBs for mobile phones, battery chargers, power banks, laptops, and many more.

Venture has the best PCB solutions in the industry and the best customer service.

Your Leading Power Bank PCB Supplier in China

Venture has more than 10 years of experience in PCB manufacturing. We are supplying and manufacturing all types of PCBs for power banks.

A power bank PCB has two main parts. The first one is the power bank battery charging circuit, this is made by using TP4056. The second one is DC to DC boost converter part, XL6009 is used to make this.

To boost the voltage from 3.7v to 4.5v-6v, we should use the DC to DC boost converter part.

To charge a 18650 lithium cell, a micro USB pin should be used. And to charge a mobile phone, a female USB pin connector is used.

And about the mode of charging for a 18650 mobile or cell phone, the slide switch is used so that the mode will be changed.

If you have more questions about Venture power bank PCB, don’t hesitate to contact us. We have the best customer service.

We accept small or large orders of your power bank PCBs.

Contact us now!

Power Bank PCB: The Ultimate FAQ Guide


I know probably, you’re looking for a suitable power bank PCB.

A reason this guide will answer all your questions on power bank PCB.

Keep reading to learn more.

What Is Power Bank PCB Used For?

A power bank PCB is used to provide platform for mechanically supporting and electrically connecting electronic components to build circuitry for power banks.

Conductive pathways made of copper are engraved on the PCB substrate together with other electronic components to make power banks.

The power banks are used to provide portable power to devices that are battery powered such as smartphones.

A power bank PCB has, embedded on it, USB interfaces through which mobile phones are connected.

Power Bank PCB

Power Bank PCB

Which Are The System-On-A-Chip (SOC) ICs Used In Power Bank PCB?

The common SOCs employed in power bank PCB include:

XL6009 IC

The main switching component used in making DC-DC converter. It is a wide range, current mode DC-DC converter and can generate positive or negative output voltages.


A complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries. It protects the cell from overcharging and undercharging.

Its thin small outline package (SOP) and low external component count makes it ideal for making portable power devices. It can also work with USB and wall adapter making it even more suitable for portable applications.

TP 4056 Micro USB Lithium Battery Charging Converter

TP 4056 Micro USB Lithium Battery Charging Converter

How Does TP4056 Power Bank PCB Vs. IP5328P Power Bank PCB Compare?

2.9V trickle charge thresholdSupport USB C DRIP input/output
Supports constant voltage constant current charging mechanismSupports up to 5.0A charging current at battery port
Does not support quick chargeSupports QC2.0/Qc3.0 output

Table 1: Comparisons between TP4056 and IP5328P ICs

How Many Pins Are There In TP4056 IC Of Power Bank PCB Module?

TP4056 lithium-ion battery charger IC is an 8-pin IC, the pins being BAT, TEMP, GND, VCC, PROG, and CE. The image below is a pin diagram of the TP 4056 IC chip.

TP4056 lithium-ion battery charger IC

TP4056 lithium-ion battery charger IC

What Are The Main Power Bank PCB Components?

The main components of power bank PCB consist of:

  • Lithium cell
  • Variable Resistor
  • LED
  • Diode
  • Printed Circuit Board
  • Integrated Circuit
  • XL6009
  • Inductor
  • Female USB Connector
  • Female Charging Pin
  • Capacitor
  • Burgstick

How Many USB Ports Can Power Bank PCB Assembly Support?

In most cases, power bank PCB feature dual ports, that’s USB-A and USB-C ports.

What Are The Supported Output Protocols Of Quick Charge Power Bank PCB?

Most quick charge power bank PCB modules feature these two output protocols:

  • Quick Charge 3.0
  • Quick Charge 2.0

Can Power Bank PCB Adjust The Charging Current?

Yes. The PCBs have adaptive charging current adjustment feature that enables them to adjust current up to even 5A depending on the load.

What Is The Maximum Battery Charging Current Of Power Bank PCB?

The current can be as high as 5.0A depending on the load.

Which Batteries Type Is Compatible With Power Bank PCB?

There are two main battery technologies used in power bank PCBs which are:

Lithium Ion

They have high power density and they don’t display the memory effect where batteries lose the ability to store charge over time. Lithium batteries are outstandingly lower in cost.

Lithium Polymer

They are in most cases strong and flexible, especially on their sizes and shapes and they generally have long lifespan. They are also light, rarely suffer electrolyte leakage, and have a low profile.

How Should You Connect The Power Bank PCB To The Battery?

The batteries are connected in a parallel configuration using a casing or by simple taping.

What Is The Output Voltage Of TP4056 Power Bank PCB?

The output voltage of TP4056 power bank PCB is 4.2V with an allowable variation of 1.5%.

Does Power Bank PCB Offer Battery Protection Capabilities?

Lithium-ion batteries used in power banks can be exposed to combustion or damage due to anomalies in the circuit conversion process. To deter that, power bank PCBs have charge controller circuits with the following protection mechanisms:

Overvoltage/Overcurrent/Over-Discharge Protection

Both overvoltage and overcurrent protection measures disable charging when voltage and current levels begin to exceed the safe threshold.

Over-discharge protection also protects the battery from over-draining below the set threshold.

Short-Circuit Protection

It stops discharging if a short-circuit occurs.

Input Overvoltage/ Overcurrent Protection

When charging the power bank, if the input voltage or current is too high, then the charging will be automatically stopped.

Over-Temperature Protection

Whether it is the power bank PCB battery charging or the device, charging is suspend whenever temperatures get too high.

Is There Limit To Total Number Of Batteries You Can Use With Power Bank PCB?

The capacity of power bank PCB batteries is measured in mAh.  It is one of the crucial features to consider when purchasing your power bank PCBs.

Your power bank PCB battery’s capacity is the total amount of charge it will be able to hold. The right mAh capacity to go for will depend on the number of devices you intend to charge.

If you wish to charge up to 3 or 4 smart phones then you may go for a 10,000mAh power bank PCB. If you have heavy duty devices such as Nintendo switch then you need power bank PCBs as huge as 20,000mAh or more.

The best way to determine the mAh capacity you need is to look at the capacity of your battery.

If your phone has a battery capacity of 2000mAh, then a power bank PCB of 2000mAh or slightly higher will serve you well.

Of course there must be a limit to the size of battery a power bank PCB can accommodate.

If a battery is too big we lose sight of the goal of making power banks which is that they should be portable.

There are, however, various sizes of power bank PCB batteries which can be divided into three major groups.

There is the small category of power bank PCBS with storage capacity ranging from 2500mAh to 3000mAh.

Small power bank PCBs are those that can give smartphones one full charge though that might not be the case all the time.

That is because smartphones are continuously evolving these days and are coming with even larger batteries.

A good small power bank PCB should be able to give your smartphone between 60% and 100% charge. Small power bank PCBs are cheap and small in size so that it is easy to carry them around even in your pockets.

The challenge associated with small power bank PCBs is that they have small charging capacity.

The second category is the medium size power bank PCBs with mAh capacity ranging between 3500mAh and 10000mAh.

Such power bank PCB devices can fully charge a big battery such as two average smartphone batteries.

The medium power bank PCBs are ideal for those wishing to charge their phones once in a day and throughout the night.

They are also the type of power bank PCBs ideal for users who would want to go camping over the weekend.

The third category is the large power bank PCBs with mAh capacities running beyond 10000mAh.

There are various power bank PCBs in this category with some having mAh capacities as high as 40000MmAh.

Large power bank PCBs give more power and they are definitely more costly. They can give 5 or more smartphones full charges. T

Large power bank PCBs are ideal for those who can be away from wall sockets for several days or those who may need to charge several devices.

What Is Better Between QC2.0 Vs QC3.0 Input And Output Protocols Of Quick Charge Power Bank PCB?

Quick charge 3.0 is expected to charge faster than version 2.0. However, the truth is that there is no significant difference in charging time between the two versions.

The improvement in Quick Charge 3.0 is the INOV (Intelligent Negotiation for Output Voltage). INOV gives a more fine-tuned power output and also optimizes charging cycle.

Various batteries accept different charging voltages. Quick Charge 2.0 protocol supported four models which are 5V/2A, 9V/2A, 12V/1.67A, and 20V at varying power.

QC3.0, due to INOV capability, communicates with the device being charged to request any voltage between 3.2V and 20V at increments of 200mV.

That allows QC3.0 a wider selection of voltages and that’s what makes it better than Quick Charge 2.0.

QC3.0 Power Bank PCB Module

QC3.0 Power Bank PCB Module

INOV has come with the advantage of being able to vary the charging voltage over the battery charging cycle. As the battery gets fuller, it draws less and less current.

It is partly because of INOV technology that it takes longer to charge a battery during the last 20% than the first 20%.

The INOV technology allows the phone to seek only the voltage it needs to build the required charging current thus maximizing efficiency.

The charging efficiency enabled by INOV reduces energy wastage during charging.

Previously, extra power would be lost in form of heat, warming up your gadget thus reducing the lifespan of your battery.

By optimizing efficiency, less power is wasted and there’s therefore less heat dissipated. Qualcomm asserts that QC3.0 is up to 38% more efficient than QC 2.0 and that’s a lot of energy saved.

So energy efficiency is what makes Quick Charge 3.0 superior to Quick Charge 2.0. That is no mean feat because cooler batteries will have more longevity than hot ones.

Why Do You Need DC-DC Boost Converter In Power Bank PCB Assembly?

The purpose DC-DC boost converter is used to step up the incoming voltage to a higher level that is required by the load.

Besides, the converter achieves that by storing energy in an inductor and releasing it to the load at a higher voltage.

The power supplied by the battery is normally at a low voltage.

Also, the boost converter is therefore relied upon for the stable 5V supply at the output.

Which Are The Recommended Software For Designing Power Bank PCB?

There are several software available for designing power bank PCBs. Some of the mostly used are:

  • Autodesk Eagle
  • Altium Designer
  • Proteus
  • KiCad EDA
  • Cadence
  • DesignSpark
  • Protel
  • Cadstar
  • Sprint-Layout
  • EasyEDA
  • SolidWorks PCB

How Can You Reduce EMI Noise In Power Bank PCB?

Electromagnetic Interference (EMI) refers to the electromagnetic energy that interferes with the signaling in your electronic device by means of induction or radiation.

Since EMI can affect critical operations in real life, power bank PCBs must meet EMI standards before they are released to the market.

There are various techniques that can be employed to reduce EMI disruptions in power bank PCBs. They include:

Ground Plane

Ground plane is the copper foil layer in your PCB. It is usually the first measure to reduce noise produced by electromagnetic interference in your power bank PCB.

The ground plane acts as a 0 volt reference line to the power supply ground terminal thus providing return path for current. That is why the ground plane takes up much of the cross sectional area of the board.

Reducing EMI begins with how effectively you make use of the ground plane in your power bank PCB. Some of the ways of reducing EMI using ground plane are:

Use Multi-Layered Board

Using more than one layer gives you more options of dealing with high speed traces on your board. Crosstalk can be redirected to inner layers where noise is lowered.

Use Split Ground Planes With Caution

If you are going to split your ground plane then it should really be necessary. That is because split ground planes can behave as slot antennas and release radiations.

Only Connect Ground Planes At A Single Point

Having more than one ground connection creates room for many loopholes hence increasing the chances of radiating.

Connect Bypass Or Decoupling Capacitors To The Ground Plane

Connecting the capacitors help in reducing the return current path thus reducing radiations.

Trace Layout

The recommended practices for trace layout are:

Avoid Sharp Right-Angle Bends

Capacitance increases at sharp bends leading to reflections. This can be avoided by using round bends instead.

Separate Signals

Low speed signals should be separated from high speed ones

Use Vias Sparingly

Vias add their own inductance and capacitance effects which may lead to reflections resulting from change in characteristic impedance. They should therefore be used with caution.

  • Other trace related measures of reducing EMI are avoiding using vias in differential traces and keeping return paths short. You should also try to route differential traces as close as possible.

Arrangement Of Components

Taking into account the effect of each component can lead to a better design for your power bank PCB. Some of the factors to consider in your PCB components’ layout include:

Separate Digital Circuits From Analog Circuits

Keeping DC circuits isolated from AC ones help in avoiding crosstalk and other problems. Using shields, using separate grounds, and taking advantage of multi-layers can help in achieving that.

Isolate High-Speed Components

High frequency components such as clocks in GPUs and CPUs can be isolated from the low speed ones by shielding and filtering.

EMI Shielding

Components that will inevitably produce EMI can be shielded using a Faraday cage.

What Are The Applications Of Power Bank PCB?

Power bank PCBs are used in various industries including aerospace, security, automotive, medical, buildings, and many others. The following are some of the areas you will find power bank PCBs in use:


Power bank PCBs can be used to power LED lights in case of mains loss.  LEDs are preferred in various industries because of their compactness, energy efficiency, and long life.

The other role power bank PCBs play in LEDs is the transfer of heat away from the lights thus increasing their lifespan.

High temperatures LEDs deteriorate very fast.

LED lighting technology is used in residential lighting, computer displays, medical lighting, automotive displays, and across other industries.

That implies that power bank PCBs are also used in these industries.

Consumer Electronics

Smartphones, iPads, and other electronic gadgets we use daily sometimes rely on power banks to power them. So the industry also relies on power bank PCBs.

Power Bank PCB Application

Power Bank PCB Application

Industrial Equipment

In the industrial sector, power bank PCBs can be used to power measuring equipment.

The PCBs can be used to provide portable power to equipment that measure pressure, temperature, and other elements.

Aerospace Components

In the aerospace industry, power bank PCBs can be used to power monitoring equipment, communication equipment, and power supplies.

Safety And Security Equipment

Security systems, at home and public places, rely on power bank PCBs to keep them on when the primary power source isn’t available.

Remember the systems are critical to security and safety thus should remain on all the time.

Security cameras may need power banks to provide backup power when there is loss of mains power implying that they rely on PCBs.

Smoke detectors and similar items such as carbon monoxide detectors and heat detectors also rely on power bank PCBs.

Electronic door locks, motion sensors, and burglar alarms are other security gadgets that rely on power bank PCBs for backup power.

How Do You Repair Power Bank Circuit Board?

Power bank PCBs, just like other PCBs, are complex and their repairs should better be left to the skilled professionals.

References can also be made to the user manual if necessary.

Before beginning to repair your power bank PCB, you need to know what the problem really is.

You need to perform a diagnosis to know what is wrong with your PCB so that you treat the real disease.

Besides problem diagnosis, one also needs to assemble the right tools needed for PCB repair works. The PCB repair requirements are:

  • Multi-meter
  • Soldering iron
  • Soldering station
  • De-soldering pump
  • De-soldering wire
  • PCB holder
  • Magnifying lamp
  • Electronic repair toolkit
  • Solder bar or paste
  • Flux

For large-scale power bank PCB repairs, a company might need to use a selective soldering machine.

The machine selectively picks and places components then solders automatically.

Your PCB breakdown could be due to component failure, physical damage, trace damage, poor design, or power failure.

There are damages you will easily spot when you open your power bank such as loose components, burnt components, or broken parts.

Trace damage can also be investigated by scanning along the copper pathway to spot any signs of broken line.

Sometimes specialized measuring instruments may be required to diagnose problems in PCBs though.

A multi-meter might be needed to test for continuity if current is flowing through components.

An oscilloscope may also be used to measure signal strengths and waveforms at various parts of the PCB.

A physical damage of your PCB can be corrected by remodeling the board, soldering its components afresh, and redoing conductive traces.

Failed components should simply be extracted using the right tools such as hot air gun and tweezers and be replaced.

Broken traces are repaired by re-soldering the pathways using the right material, whether it is copper, aluminum, gold, or silver.

Power failure issues can be corrected by replacing the power supply component of the power bank PCB.

Are There Solar Power Bank PCB Modules?

Yes, there are power bank PCB modules designed to utilize solar energy to charge up.

The modules have photovoltaic solar panels that harness solar energy to convert it to electric energy.

Solar powered PCB modules can only trickle charge the power bank battery when placed in the sunlight because the cells are very small.

The modules are suitable for use only in sunny conditions.

Since solar charging is slow, the power bank PCB modules are designed to accept USB charging too. Sunlight acts as a useful back especially when one finds himself far away from the mains power.

Some of the solar powered power bank modules have panels that fold out to present a large surface area to the sunlight.

Do Power bank PCBs Have To Be UL Certified?

Power bank PCBs do not necessarily have to be UL certified. There are no laws dictating that UL marks must be used on power bank PCBs.

Manufactures voluntarily submit their PCBs for UL certification.There are jurisdictions, though, such as some municipalities in the US where products such as power bank PCBs have to be UL certified.

The municipalities have regulations requiring products to be tested by nationally recognized testing laboratories such as UL before they can be sold.

Although UL certification is not mandatory, it is advisable for consumers to go for products that are certified by nationally recognized testing laboratories.

By buying UL certified products, consumers can be assured that the PCBs meet the required safety standards.

UL certification also guarantees that the manufacturer will conduct occasional inspections to verify if the products continue to conform to safety standards.

UL certification is even a good thing for suppliers because customers will most likely go for certified products.

What Is The Cost Of Power Bank PCB?

The cost of a power bank PCB is not fixed. Considering the complexity of power bank PCBs and the factors that go into building them, they are sold at a variety of prices.

Power bank PCBs can be priced as low as $10 or as high as $50 depending on a number of factors.

The actual price of power bank PCBs will be determined by the manufacturer depending on the following factors:

Power Bank PCB Assembly

Power Bank PCB Assembly

Type Of PCB Material

PCBs are built out of different materials such as polymer inks, fiber glass, and solder. The conductive pathways are normally made from copper, gold, or silver.

The cost of PCB materials used will determine the ultimate price of the board.

For instance, a board of higher frequency will be made from gold or silver instead of copper leading to a more expensive PCB.

PCB Size And The Number Of Layers

Multi-layered power bank PCBs cost more than single-layered ones. Bigger boards will also definitely cost more than the smaller ones.

The space that components occupy increases the cost of bigger PCBs. The prices increase because bigger boards and those with more layers take more time to manufacture.

Size Of Board Holes

Drilling of holes in power bank PCBs can also determine their costs. The holes help in aiding communication between different components or keeping the PCB together.

Drilling the holes need precision especially if the board is thick or compact resulting in cost implications.

Cost Of Labor

Producing power bank PCBs is done by skilled professionals using automated machines. Due to that, labor cost has to be factored in while determining the final price of power bank PCBs.

Expected Turnaround Time

A manufacturer will charge more money if the order to deliver PCBs is urgent. That is because the manufacturer will put other orders on hold to work on the urgent order.

A manufacturer putting other orders on hold to get a quick turnaround on an urgent order will charge more for a PCB. The extra charge is meant to cover for putting other orders on hold.

It is advisable that you put your orders early to reduce cost. It saves your manufacturer the hassles of having to pay overtime or pay more to ship parts.

Quantity Of PCB In The Order

Power bank PCBs can be bought cheaply if bought in bulk. The rest of the PCBs can be duplicated once the prototype has been made.

Mostly suppliers are willing to discount bulk orders so one can take advantage of that to reduce cost.

Technology Used To Make The Power Bank PCBs

The technology adopted by a manufacturer to make PCBs will also affect their final prices.  Surface mounting technology is less expensive than through-hole technology hence will lead to cheaper power bank PCBs.

Surface mounting technology is cheaper because it uses more automation and less labor leading to reduced labor costs.

What Is The Lifespan Of A Power Bank PCB?

The life expectancy of a power bank PCB cannot be fixed to a particular length of time but is dependent on several factors such as:

Frequency Of Charging

A power bank PCB battery charged several times a day will deteriorate faster than one charged once in a week. The inbuilt battery on the PCB degrades over time due to cycles of charging and discharging that makes it lose its storage ability.

A dead battery means the PCB on which it is built will also be of no use. The components of the power bank PCB can be extracted for use in other projects though.

Quality Of Power Bank PCB

The life expectancy of a power bank PCB is also determined by its model and make. Power bank PCBs that are made of high quality substrate, laminate, and copper materials are likely to last long.

Power bank PCBs that have high thermal resistivity and are mechanically strong to withstand environmental elements will also last long.

It is also advisable to check the warranty period before committing to buy a power bank PCB. The PCB with a longer warranty period will most likely be of high quality and is the one you should pick.


How the ultimate user handles a power bank also determines how long a power bank PCB will last. If the power bank is stored in a cool dry place then the PCB is likely to last long.

Users who are tender with their power banks and don’t drop them time and again can have their PCBs serving them for long.

For a durable power bank PCB, one should be willing to spend a little bit more money to get a high quality one.

It is also recommended that you buy from suppliers with good reputation for making high quality power bank PCBs.

What Does Conversion Rate Mean In Power Bank PCB?

Conversion rate in a power bank PCB simply refers to the power output of its internal battery cells at the nominal voltage.

Nominal voltage here means the value assigned to the charging circuit to designate its voltage class, for instance 5V.

Conversion rate is sometimes referred to as conversion efficiency. The higher the conversion rate, the better the performance of the power bank PCB.

If you charge your power bank with 100 points of electricity but it gives out 80 points then its conversion rate is 80%. The conversion rate can never be 100% due to losses incurred in the circuitry.

How Do I Pick The Best Power Bank PCB?

When you buy power bank PCBs, you need to be keen on the following features:


The capacity of a power bank PCB is measured in mAh.  It is one of the crucial features to look for in your power bank PCB.

Capacity describes the total amount of charge your power bank PCB will be able to hold.

The right mAh capacity to go for will depend on the number of devices you intend to charge.

If you wish to charge up to 3 or 4 smart phones then you may go for a 10,000mAh power bank PCB.

If you have heavy duty devices then you need power bank PCBs as huge as 20,000mAh or more.

The best way to determine the mAh capacity you need is to look at the capacity of your battery.

If your phone has a battery capacity of 2000mAh, then a power bank PCB of 2000mAh or slightly higher will serve you well.

Available Ports

The number of USB ports on your power bank PCB will determine its convenience and how often you use it.

Most people are just okay with one port because they charge only one device at a time.

It is recommended that you go for a power bank PCB that has at least two ports to support dual charging.

If you travel often with friends or family then you might need a multiple ports PCB to charge several phones at a go.

Dual USB Power Bank PCB Assembly

Dual USB Power Bank PCB Assembly

Size And Weight

This might sound trivial but is an important factor to consider. No one wants to get stuck traveling around with a device as heavy as a brick.

You ideally need a device weighing not more than 10 ounces and that would comfortably fit in the palm of your hand.

Power bank PCBs with bigger storage capacities will definitely be bigger because they have larger batteries.

A multiple port power bank PCB will also be larger to provide space for the ports. The lighter your power bank PCB is, the more convenient it will be to carry it around with you.

Charging Speed

Charging speed differs from one power bank PCB to the other. Charging speed determines both how first your power bank recharges and how fast it charges your device.

A good quality power bank PCB should have at least two ports with Quick Charge of 3.0 or more. A Quick Charge 3.0 port should be able to charge your iPhone 100% in a couple of hours.

When choosing the right Quick Charge rating for your power bank PCB, consider the largest device you might want to charge.


It is important that you pick on the supplier with adequate warranty cover to cushion you from manufacturer’s defects.

You don’t want to replace your power bank PCBs out of your own pockets 30 days after purchasing them due to manufacturer’s mistakes. At least a 12 months warranty period will be adequate.

LED Indicator Lights

It is convenient to have indicators on your power bank PCB to let you know what charge is left in your power bank. That will save you the hassles of guessing when to recharge your power bank.

At Venture Electronics, design and fabricate high performance power bank PCBs depending on your unique requirements.

Contact us today for all your power bank PCBs.

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