... short circuit, the current to all the slots, except the 9V and 12V will be cut off. Once the problem has ... immediately once they are fully charged.· AAA, AA, C, D, 9V and 12VNOTE: The 12V slot is ONLY for rechargeable batteries ... time(hours)606.5 Universal Battery Charger for 1.2V , 9V .12V rechargeable battery