Li-Ion 14430 7.4V 600mah (4.44wh) battery module side by side with Protection IC (LC14430S2R1WR)
SuPower 7.2V 7.4V 8.4V 18650 2200mAh Lithium ion Li ion Rechargeable Battery Pack Max. 2A with built in protection circuit board|battery pack|18650 battery pack 7.4vlithium ion battery pack - AliExpress
Venom 20C 2S 4000mAh 7.4V Hard Case LiPo Battery with Universal Plug System and Venom Pro Touch Screen HD 45A RC LiPo/LiHV/NiMH Battery Charger Combo - Walmart.com
Amazon.com: Rechargeable Lithium Ion Battery Pack - VIDAR 7.4V 2600mAh High Capacity Li-ion Battery Pack with JST PH2.54/2P Plug-in(Customizable) for Electronics,Toys,Lighting,Equipment : Health & Household