The LLOYTRON Slimline AA / AAA Battery Charger is compatible with many battery sizes and will charge up to 4 AA or AAA sized batteries. Both NiMh and NiCd batteries can be charged; save money and reduce waste without the need for disposable batteries. Recharge your batteries to their full capacity quickly and safely. Simply plug in to a standard UK mains socket and insert your rechargeable batteries into the appropriate sized compartment. The red light will turn on to indicate that a battery has been inserted, and leave to charge for the recommended time. To calculate the charging time the battery capacity must be divided by the charging rate and so is dependent on the batteries you require. The charging rate for AA is 1.2v DC 120mA and for AAA is 1.2v DC 120mA.