Amazon.com: 5200mAh 7.4V Li-ion Battery Pack for JBL Xtreme 3, Replacement for Part No. GSP-2S2P-XT3A : Electronics
Parigha® 7.4V Li-ion 18650 Lithium ion Rechargeable Battery Pack 2S2P 8.4V 5000mAh Battery Pack for Project with BMS 2A : Amazon.in: Electronics
Using Li-Ion Battery Pack for Long Range FPV Flying - Oscar Liang
MAEnt™ 7.4V Li-ion 18650 Lithium ion Rechargeable Battery Pack 2S2P 8.4V Battery Pack for GPS i Pod P sp/DVD/mp4 Tablet PC Drones Project Work Industrial Equipment (4400 mah) : Amazon.in: Electronics