Is it possible to charge several batteries of different sizes at the same time?
Yes, it is possible. The charger interprets it as one battery. Although, make sure that the combined Ah is not larger than our recommendation for your charger and that the cables between the different batteries are strong enough for the energy given. You can get a lot of current from the charged battery to the uncharged battery which can overload the cables; this is regardless of the charger. The best way is to charge each battery first and then connect them all together. When several batteries are connected in parallel the positive clamp should be connected to the positive terminal on one side and the negative clamp connected on the negative terminal on the other side of the connected batteries.
