This 20-pack of 3150mAh Ultimaxx AA NiMH Rechargeable Batteries is a package of 20 AA size nickel-metal hydride (NiMH) rechargeable batteries. Each has a voltage of 1.2V and a capacity of 3150mAh. These batteries feature excellent high-drain performance and can be recharged up to 1000 times. Additionally, they are mercury-free and environmentally friendly.

The Ultimaxx charger will recharge 4 of these included batteries in about 280 min, or 2 in about 140 min. You can also use it to charge optional AA NiCd batteries, or AAA NiMH or NiCd's. The charger's integrated micro-controller ensures that each battery is charged to its full capacity, and automatic charge cut-off prevents overcharging. Should the controller and automatic cut-off function both fail, the safety guard timer will kick in to ensure that the charger still shuts off after 6 hr. The charger also has circuit and polarity protection. Two LED indicators display charging status, and there are two individually-monitored charging channels.