DIY Power Bank: 14.4V Battery Conversion Guide

If you are interested in DIY power banks, you might want to take a look at this article.

If you happen to have a robot vacuum cleaner, but it is broken, you can remove its battery (Desay BRR-2P4S-5200D). You can check it with a multimeter, and it shows a standard 14.4V output. You can reuse this battery and convert it into a power bank.

If you happen to have a DC-DC converter board and an MX3.0 female connector.

First, you remove a round female power socket from a scrap board and reserve it as the charging port.

Then you solder according to the diagram. You should note that in the original charger, the red wire is positive, the black wire is negative, and the middle wire is the temperature protocol line.

You plug in the battery, the indicator light turns on, and it can charge. You should be careful with the wiring order, because incorrect connections may cause a short circuit or even an explosion.

If you happen to have a charging adapter with a 14.4V output, you plug in the charger, the red light turns on, and the setup is complete.