batteries - What's inside power bank car jumper - Electrical Engineering Stack Exchange

All powerbanks that have car-jump function have some thingy between the clamps and powerbank socket: What's inside that thingy? The manufacturers typically claim 300A of starting current for powe

batteries - Output voltage of powerbank circuit is the same as the

Car Battery Jump Starter - 12V 6.0L Compact Power Bank With Jump

Powerful Car Jump Starter - HW car jump starter with air compressor provides up to 2500A peak current, can jump start all 12V cars in 1-3 seconds,

HW Car Jump Starter with Air Compressor, 2500A Peak 21800 mAh 12V Car Battery Booster Pack (8.5L Gas/6.5L Diesel), 150PSI Digital Tire Inflator, Auto

What happens if you hook up two batteries backwards on a boat

bms - Battery management system - Electrical Engineering Stack