This is a bit of an obscure question, but maybe someone here has figured out a solution.

I've got an Aftershokz Aeropex headset that I wear when riding. I've found that it will charge from a charger plugged into a wall socket, but not from a USB power bank--it draws so little power when charging that the power bank just shuts off after a minute. I'm wondering if anyone has found a magic power bank that will charge it, or knows of a way to force a power bank to keep charging it.

I've got an upcoming event that will last considerably longer than the batteries on the headset, so I'd like to be able to recharge it in the field. I'll have a pit station, but without utilities, so I'll need to provide my own power. I'm not going to rent or borrow a gas generator just for this.