Lithium Ion Polymer Battery - 3.7v 500mAh : ID 1578 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Blomiky 2 Pack 3.7V 500mAh Li-ion Rechargeable Battery SM 2P Plug with USB Charger Cable for Double Sided RC Stunt Car Small RC Boat Tumbling Amphibious RC Car RC Truck and
3.7V Rechargeable Li Polymer Battery LP802231 500mAh With PCM and Wires
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Lithium ion Polymer Battery LP602535 3.7V 500mAh 1.85Wh with protection circuit and wires 50mm and JST SHR-02V-S-B
3.7v 500mah 652631 Lithium Polymer Lipo Li Ion Rechargeable Battery For Mp3 Mp4 Mp5 Gps Psp Bluetooth Electronics Part - Digital Batteries - AliExpress