... , sliding spring loaded negative pole which makesinserting any type battery a breeze and can charge up to 4 batteries ... Ni-CAD (Nickel Cadmium)* Ni-MH (Nickel Metal Hydride)* Battery Sizes Supported:* 1-4 batteries of: AAA, AA, N ... CE approval with the following protection schemes:* Alkaline battery protection, faulty battery protection, overcharge protection, short circuitprotection, wrong polarity ...