The LiPo batteries are composed of a lithium-based cathode and anode separated by a polymer electrolyte they are used in, phones, cars, bikes, etc and all types of models!
ALWAYS READ THE MANUAL AND CHARGE OUTSIDE IN A SAFE DRY PLACE!!!

Overlander
2200mAh 2S 7.4v LiPo Battery Receiver Pack - Overlander Digi-Power
$21.27
Re-stocking soonSave $0.70

Overlander
1000mAh 2S 7.4v LiPo Battery Receiver Pack - Overlander Digi-Power
$12.59
$13.29
Re-stocking soonSave $0.56

Overlander
3250mAh 2S 7.4v 55C LiPo Battery in Hard Case - Overlander Sport Track
$27.62
$28.18
In stockSave $1.06


Overlander
Overlander 4200mAh 2S 7.4v 55C LiPo Battery in Hard Case - XT60 - Overlander Sport Track
$30.85
$31.91
Only 2 units leftSave $1.95

Overlander
Overlander Ultrasport Extreme 3700mAh 2S 7.4V 50C Lipo Battery
$35.28
$37.23
Re-stocking soonSave $0.96

Overlander
1600mAh 2S 7.4v LiPo Battery Receiver Pack - Overlander Digi-Power
$17.12
$18.08
Re-stocking soon