DIY Fast Charging Lithium Battery Charger with IP2312

Everything in the world is constantly evolving, and chargers are no exception. If you need a lithium battery charger that can charge quickly, the charging solutions such as TP4056 and TP5000 are relatively slow. Therefore, let's DIY a fast charging charger for unexpected needs.

Based on the IP2312 chip from Yingjiexin, the charging module uses synchronous switch buck to achieve high efficiency and low heat. The maximum charging current of the module is 3A, and the interface is Type-C.

The IP2312 in SOP8 package supports 3A charging. The module will first perform constant current charging according to the set 3A current, and then switch to constant voltage charging when the voltage is close to 4.2V. The overall charging speed is very fast.

The back of the module has jumper instructions, and the module supports 4.2V or 4.35V lithium batteries.

For the 18650 battery slot, it is recommended to choose the type with a spring structure for good contact between the spring and the battery, which is very suitable for high-current charging. The type with a spring negative pole should not be used here.

Choose a 22AWG single-strand tinned copper wire for the wire, which has a cross-sectional area of 0.32 square millimeters and can handle a current of up to 3A.

Flatten the legs of the spring contacts as much as possible.

Solder the wires.

After the wires are soldered to the module, apply some adhesive to the battery slot terminal face, stick the module on it, hold it by hand for a few minutes, and the strength will be high. The curing is very fast.

After sticking the module, it will protrude relative to the bottom of the battery slot and needs to be handled.

Find some double-sided foam tape and Teflon scissors, cut a suitable piece of foam tape and stick it to the bottom of the battery slot, and then cut a slightly thicker piece of cardboard.

After sticking the cardboard, the module will no longer protrude.

Finally, let's beautify it with some electrical tape.

Charging is normal.

It only takes about an hour and a half to fully charge a 2600mAh 18650 battery, which is much faster and generates much less heat than TP4056, and although TP5000 also has a 2A charging speed, it is still inferior to IP2312.

Please note that if the battery is old, the IP2312 may not light up because the old battery cannot reach a voltage of 4.15V, which is the cutoff voltage for the IP2312. In this case, the charger will continue to charge slowly with a very small current. However, the IP2312 has a protection logic, and if the continuous charging time reaches 24 hours, it will automatically terminate the charging.

The new charger is now complete.