Amazon.com: 1Pcs 18650 3.7v 4400mAh 1S2P Li ion Rechargeable Battery Pack with 2.0Pin JST-PH Connector 16.28Wh/4.4A, Blue, 6.6 x 1.8 cm (19.28Wh/4.4A) : Health & Household
Amazon.com: Qimoo 3.7V 4400mah-16.28Wh Rechargeable Battery Pack Lithium Ion Batteries with PH2.0mm Connector for DIY Electronics Products, Toys, Lighting, Bluetooth Equipment : Health & Household
WONDOM Lithium Polymer 503040 Flat Battery 3.7V 600mAh 5 x 30 x 42mm with Plug
Lithium Ion Battery Pack - 3.7V 6600mAh : ID 353 : $24.50 : Adafruit Industries, Unique & fun DIY electronics and kits
YDL 3.7V 500mAh 652533 Lipo battery Rechargeable Lithium Polymer ion
3.7 v 7800 mah (3 x 18650) li-ion Battery Pack w/ Board
21700 NMC 3.7V 4800mAh Rechargeable Lithium ion Battery For DIY 12V 24V 48V Battery Pack Flashlight Power Bank – SeLian Energy