Efficiency is about 50%.
Car Jump Starter 3000A, Jump Starter Battery Pack for Up to10.0L Gas 8.0L Diesel
WOLFBOX Car Jump Starter 3000A Booster Jumper Power Bank Battery Charge Portable
TOPDON JumpSurge300 Upgraded Car Jump Starter 3000A 24000mAh Boost Pack Charger
GOOLOO GP3000 Car Jump Starter 3000A Peak SuperSafe Battery Booster Charger
Car Jump Starter 3000A with Air Compressor 12V Battery Booster Power Pack Bank
