- Apr 3, 2016
A proper (as in not unsafe) charging circuit for lithium batteries has preset max amperage (I_max - hardwired and/or somehow provided) to allow towards the battery. It'll then adjust the charging voltage (U_c) to maintain I_c at I_max, until U_c hits preset U_max. I.e provided the battery is low enough at the start and the circuit gets enough power provided first I_c will be constant at I_max and U_c will rise, then at some point it changes to U_c is constant at U_max and I_c goes down, until I_c hits preset I_min, then it stops. (Not all do stop, some go on trickling.)I don't think amps work that way. Your power supply should at least be able to cope with the power demands of the device, but being rated higher just generally means the power supply (transformer) gets less hot.