Trying to get my head around some ideas about "rechargeable" batteries and getting in a muddle! So I get the idea that rechargeable is a rubbish word for them but I have 2 questions: 1) Does heat loss (i.e. from bulbs) in a DC circuit result in eventual lower PD across a cell? Thinking in terms of energy if PD provides the energy to make current flow, then surely if some of that energy is lost during transmission, by the time it returns to the cell some of that energy is lost and the PD will be reduced... 2) Is it energy that is replaced in a battery when it is "recharged"? i.e. the electrical energy is converted into chemical energy and stored within the battery until it "discharges" that energy into a circuit?