The easiest way to add rechargeable power to your wearable projects — this ultra-compact USB-C lithium battery charging board is small enough to sew directly into a cuff, garment, or jewellery piece. No more disconnecting the battery to charge; just plug in a USB-C cable.
I use these in almost all of my wearable builds. Smaller and more discreet than the traditional blue TP4056 boards, with a full protection circuit built in.
Specs
Input: 5–6V (USB-C or wired)
Output: 3.7V single-cell lithium (parallel connection supported, no series)
Charge current: 1A default
Auto-termination when current drops to 100mA at float voltage
Pre-charge at 100mA when battery is below 2.9V
Overdischarge protection: 2.4V
Overcurrent protection: 4A
Overvoltage protection: included
Important notes
First use: Connect power supply first to activate the protection board
Battery connections must be soldered — use wire that isn't too thin
