**Independent Battery Charger Slot -Charge 1.2V NiMH or NiCD AAA/AA rechargeable batteries at any time without having to charge only in pairs. **4 bay charging station - Battery detection technology, automatically turn to trickle charge when batteries are full charged; Advanced MCU control and -V function, over-heat and over-current protection, short-circuit protection, non-rechargeable and defective battery detection. **Refresh Cycle Rechargeable Battery Charger: Easy to use with cycling function, discharge and fully charge your cells to extend their life and overall performance, especially deep cleaning of Nicd Package Contents: 4 x 1.2V AA Ni-MH 3000mAh + 4 x 1.2V AAA Ni-MH 1100mAh Rechargeable Batteries with 4 Bay battery charger + 2 x Battery Case.