I was thinking very generally, since there is no charger port on most electronics' batteries and instead the charger port is on the appliance itself, that the battery must be in parallel with the circuitry on the actual appliance when the charger is charging, but then when the charger is removed it must be in series with the circuitry to actually cause a voltage drop. its probably much more complicated than this, but is this basically how it works?
but then when the charger is removed it must be in series with the circuitry to actually cause a voltage drop Not sure what you mean by this, but the charger is indeed in parallel with the battery and the load. Why do you think it is in series? what is the voltage drop ? The charger is in parallel with the battery as long as it is plugged in. When it is removed, it is no longer connected, (series or parallel, it is not connected when it is unplugged). Email me if you can clarify this question. .