I want to be able to charge my hearing aids when I do not have access to mains power. My current power pack, for use with my dynamo to charge things on the go, will not work for this purpose as I think the current draw is too low.
When I use the USB output on this power pack to charge my hearing aids, they get charged up to 85% and then the power pack switches off. The HA charger has a drying function which uses a small fan. The drying cycle runs for 3 hours. I think what happens is that when the fan goes off, there is no longer enough current being drawn and the power pack turns off.
The USB C charging port on the power pack can be used as an output. When I use this to charge the HAs, they recharge to about 90%. I think this is because the USB C end does not have the shut-off circuitry.
I think I’d be better off with just a normal rechargeable cell for this purpose. What would be best? Something robust and preferably directly rechargeable rather than requiring a battery charger would be best.