# What happens when we connect two identical batteries in parallel with a resistance R?

I read somewhere that the voltage stays the same(it will be equal to the voltage of one of the batteries) but the output capacity increases. What does this mean? Will the current in the resistor increase?

Applying superposition theorem I see short circuits and therefore almost zero current going through the resistor. Am I right? So where's the increase and again what is output capacity?

We have something like this with a resistor across AB:

• Can you include a schematic of the wiring arrangement you are describing? Or describe it better, i.e. are both batteries in parallel also? Commented Mar 18, 2017 at 21:12
• if the batteries are truly identical, then the voltage of one battery is equal to the voltage of the other battery. Commented Mar 18, 2017 at 21:13
• Oh you mean a resistor in series between the positive terminals of two batteries, right? Commented Mar 18, 2017 at 21:15
• @AngeloQ I added a picture. Commented Mar 18, 2017 at 21:23
• Thanks, see it. No the current doesn't increase because the voltage hasn't increased. I = V/R Output capacity does increase though (Ahr rating is doubled). Commented Mar 18, 2017 at 21:23