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Rechargeable battery: Li-ion 18650 3,7V 3250mAh
3.7v 500mah Lithium Polymer Lipo Rechargeable Battery With Jst 1.0mm 3pin Connector 582535 For Mp3 Gps Bluetooth Camera Watch - Rechargeable Batteries - AliExpress
Lithium Ion Battery Pack - 3.7V 4400mAh : ID 354 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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3.7V 7800mAh Rechargeable Lithium Battery Red
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3.7V Rechargeable Lithium ion Battery LP18650A+ 3500mAh With PCM and JST XHP-2 Connector