Amazon.com: YDL 3.7V 650mAh 652540 Lipo Battery Rechargeable Lithium Polymer Ion Batteries with PH2.0mm JST Connector : Health & Household
4/5 AA 3.7 Volt Lithium Ion 14430 Flat Top Battery (650 mAh)
Amazon.com: CaoDuRen MSDS Verified Part Number: 652540 Replace for 602540, Rechargeable 3.7V 650mAh Li Lipo Lithium Polymer Ion Battery Pack with 2 Pin 2.0mm JST Connector : Health & Household