What Is Pass-Through Charging In Power Banks?

Here, we will outline what exactly pass-through charging is, and this is in relation to power banks.

What Is Pass-Through Charging In Power Banks

What Exactly Is Pass-Through Charging?

So to keep this as simple as possible, pass-through charging is a technology that is built into power banks which let a device be connected and also recharged whilst a power bank is plugged into a wall socket, and subsequently charging itself.

It is true that this technology really makes use of a series of power that regulates circuits. These circuits ultimately match the amount of energy which is required by a connected device. This has to match the amps that are being drawn out from the wall outlet.

In fact, if this is something that is done right then pass-through will actually send power from the wall socket and into the output device that is connected by the power bank.

It is important to mention that the rate of charge ultimately depends on the load balance performance of the power bank.

How Does Pass-Through Charging Really Work?

It is important to note that pass-through charging is not actually supported by all power banks. In fact, if you happen to own a power bank that does not have pass-through charging and you choose to plug the power bank into a wall outlet then the outputs will turn off.

The outputs will actually remain in this state until there is some kind of manual intervention.

Ultimately, if this is something that does not occur then it is much more likely that there will be damage done to the power bank as also to its battery. In fact, it is actually quite unsafe to try this because it would end up delivering an outward current.

This outward current will create energy and this ends up generating heat – this causes the battery to degrade much faster. 

Alternatively, if it supported charge and recharge then both the connected device and the power bank would become fully recharged.

This can’t happen as the amount of energy that goes into the power bank is super limited so only some of it will actually go into the connected device, and then some will go to the unit. This means that ultimately it will take some time to be able to fully recharge both devices.

A Battery Can’t Charge Or Discharge At The Same Time

Something that is pretty important to remember is that a battery cannot charge or discharge at the same time. This is pretty close to being impossible.

This is because the current will just move in one direction at a time. So, ultimately the power bank will not actually get charged whilst replenishing a connected device at the same time. This is not how current works. 

The process can be likened to connecting a cell phone to a wall charger. So, first of all the cell phone will swap to being powered by the charger.

This happens because this gives time for the battery to be replenished. In fact, what happens to the battery is dependent on just how much energy is free from the charger, and also how much power is required by the cell phone.

When a cell phone is connected to a power bank which is plugged into a wall outlet, the power will then be directed straight to the phone. This means that it will consequently take the full output from the power bank.

So, if the charge input of the power bank ends up being larger than its output then it will end up discharging the battery, and this will work to increase the output power.

Alternatively, if a battery ends up decreasing to 0% then this will make the output shut off completely. This will in turn let the power bank battery take the full power from the wall socket.

It is important to remember that if you have a device connected while this goes on, then it might not get charged until the output is turned on again.

Can Pass-Through Charging Have An Effect On Battery Life?

Here’s the thing, pass-through charging can end up affecting the life of your power bank. However, there is an instance where pass-through charging might not have that much of an effect on your power bank.

This will be if the power bank uses internal circuitry as a way of matching both the input and also the output levels. In this situation, there might not end up being much of an effect on the charge capacity over time.

In fact, power banks can also lose power capacity from recharging and then discharging their batteries.

So, in order to prevent any kinds of damages to not only your connected device, but also to prevent any kinds of damages to your power bank itself you can do this…

Make sure that your power bank contains the correct circuitry that is built in to support pass-through charging. Also, you should only use the unit for a short amount of time if this is a feature that you plan on using.

This will be great at helping you to keep it from not just increasing in heat, but also this will reduce the risk of battery damage too.

Brett Jones
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