DC 3.7V 5000mAh 955565 li-ion Lithium Ion Polymer Battery Replacement for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply
3.7V Li-ion Polymer 900mAh, what is the 3rd wire for? Trying to find a replacement but higher mAh, seems like almost all only have a + & - wire : r/diyelectronics
3.7V 1300mAh 4.81Wh 102540 Rechargeable Replacement Li-Polymer Li Lipo Battery