Anybody got experience with power banks?How do they work the reason is I have a helmet cam with an internal rechargeable battery but only lasts 90 mins.If I fully charged it and connected the power bank will it keep it fully charged until power bank runs out or is a powerbank only able to recharge once cam internal battery runs out? As you can tell I know 3/4 of 7/16 of fook all about power banks.
They are just like a rechargeable battery but with USB connections. Your device will use the power in the bank first, as if it was plugged in.