Apple Rechargeable NiMH AA Batteries 4pk 1900mAh 1.2V HR6 Charge with any NiMH AA battery charger (not included) Holds a charge for very long time with average lifespan of years. Premium batteries designed for your Apple wireless keyboards, mouse & trackpads and works great to power your other tech, gear & electronics. These are some of the best AA batteries & comparable to the performance of Eneloop batteries. You no longer have to buy or hassle with the disposal of batteries every few months. They are much more environmentally friendly. Tested working prior to shipping.