Linear Charger TP4054: A Comprehensive Guide

If you’re anything like us, and we’ll assume you are (they’re not for everyone), then you probably love your gadgets. You’ve got them all lined up on your desk or charging station, waiting to be used.

But even though they’re our best friends, sometimes they get a little bit too friendly with each other and can end up in a “bad mood.” Yes, we mean that literally — their batteries can get so out of whack that they become unresponsive.

This is why we created this guide: To teach you how to keep your gadgets healthy and happy with the TP4054 Linear Charger. We cover all the basics, from what it does to how it works, and everything in between.

What is a linear charger?

Linear chargers have a higher voltage output than trickle chargers. They’re also better for battery health because they provide a constant current or voltage to the batteries.

The TP4054 Linear Charger is one of our favorite linear chargers on the market today, as it packs all the features you need into one convenient package. It has an LED screen that displays how much power is left in your battery and what percentage of charging it has completed. Its inputs include four USB ports and two AC outlets, which make it easy to charge multiple devices at once. Plus, there’s a built-in safety fuse that protects your devices from surges or spikes in power supply.

It also comes with two USB cables and an AC adapter so it’s ready to go out of the box!

Types of linear chargers

Linear chargers are a smart, cost-effective way of charging your devices. They’re designed to fit nicely in any office or travel bag without taking up too much space. Linear chargers are also good for situations when you need to charge your device while it’s in use, like when you’re on the go and don’t want to stop using your phone.

There are two types of linear chargers: Single-port and multi-port. A single-port charger is perfect for one device at a time, while multi-port chargers charge up to four devices at once. The TP4054 Linear Charger is a perfect example of a multi-port charger, with four USB ports that allow you to charge many of your gadgets at once.

How it works

The TP4054 Linear Charger is a power supply with an integrated onboard charging IC. It will charge all current and future parallel Li-Ion battery packs in the same way as the original equipment manufacturer (OEM).

It has 4 independent outputs that can be individually configured to charge 1, 2, or 4 cells at a time. The charger also features an LED display that communicates the charging state and progress for each individual cell.

The TP4054 Linear Charger is compatible with:

1 x 18650 (2 cells)

1 x 14500 (1 cell)

4 x AA (2 cells)

4 x AAA (2 cells)

Applications and tips

The TP4054 Linear Charger is best for charging 1 to 4 AA or AAA NiMH 1.2V-1.3V cells. It’s designed to use a linear charger, which means the voltage is constant throughout the charge cycle until it reaches the battery’s full capacity. The TP4054 Linear Charger will automatically stop charging when the battery has reached its full capacity.

It should be noted that this TP4054 charger can only charge 2 or fewer cells at a time. You should also never use it to charge non-rechargeable batteries, as this could lead to damage and even fire!

The TP4064 Linear Charging Station can be connected in parallel with other chargers without short circuiting them, meaning you can monitor your batteries charging status simultaneously with one another.

You may also want to consider buying an extra power adapter if you want to charge two or more devices at once, as this charger only comes with one included power adapter. And finally, keep in mind that this kit does not come with any USB cables for charging purposes so you’ll need to provide your own USB cable.


Linear chargers are a type of battery charger that use an electronic load to convert AC power to DC power. The load is usually in the form of a resistor, which converts the AC voltage to a lower DC voltage. If you are looking for a battery charger, you might want to consider a linear charger.

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