Does state of charge of a (wet cell) battery influence charging rate with constant voltage?
Well, basically at any given moment, the battery acts like it has a secret, internal open circuit voltage (Voc) and a series resistance (Rs). The charger outputs Vin. Then the charge current, Ic, is: Ic = (Vin-Voc)/Rs. As the battery gets charged, Voc goes up, so Ic goes down. It may well be that Voc is effected by other things besides state of charge. But this is an OK first approximation to help you understand how the current is set.







simulate this circuit &ndash; Schematic created using CircuitLab