TP4056 - Micro USB 5V 1A Lithium Battery Charger with Protection [TP4056- Protection-Modules] - US $1.20 : HAOYU Electronics : Make Engineers Job Easier
lipo - How does the TP4056 overdischarge protection work? - Electrical Engineering Stack Exchange
Caution!] TP4056 board "with protection" circuit does not protect against polarity reversal (But if changing a track can it protect?) - General Electronics - Arduino Forum