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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
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vhbw Battery compatible with BEC Plug for Model Making Device e.g. Racing Car, Helicopter (720mAh, 3.7 V, Li-polymer, 44 x 25 x 9.2 mm)
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EEMB 3.7V Lipo Battery 500mAh 403048 Lithium Polymer ion Battery Rechargeable Lithium ion Polymer Battery with JST Connector (UL Certified for Cell)
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DC 3.7V 1600mAh 103048 li-ion Lithium Ion Polymer Battery Replacement for DIY Bluetooth Speaker Energy Storage LED Light Fan Hold Gift: Amazon.co.uk: Electronics & Photo
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Lithium Ion Polymer Battery - 3.7v 100mAh : ID 1570 : Adafruit Industries, Unique & fun DIY electronics and kits
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DC 3.7V 5000mAh 955565 li-ion Lithium Ion Polymer Battery Replacement for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply
![vhbw Battery compatible with SM-2P Plug for Model Making Device e.g. Racing Car, Helicopter (350mAh, 3.7 V, Li-polymer, 37 x 19 x 8 mm) vhbw Battery compatible with SM-2P Plug for Model Making Device e.g. Racing Car, Helicopter (350mAh, 3.7 V, Li-polymer, 37 x 19 x 8 mm)](https://cdn.manomano.com/images/images_products/10235169/L/91333147_3.jpg)