30C/50C, 7.4V (2S), 3300 mAh LiPo Battery (BLP-743300) – Bioenno Power
Granite - Lipo Voltage vs. State of Charge 2S - 6S Packs | ARRMA RC Forum
JEGS 45030: Low Voltage Monitor | 2S-8S LiPo Batteries | Monitors the Pack Voltage & Individual Cell Voltage | LCD Display | Low Voltage Alarm | Adjustable Alarm from 2.7V to 3.8V
ArmSoar 2S 520 mAh 7.6V HV LiPo Battery (Pack of 2)