The ENVIE ECR20+AA2800 4PL is a smart charger bundle that comes with four high-capacity 2800mAh AA Ni-MH rechargeable batteries. It supports charging 2 or 4 AA/AAA Ni-MH or Ni-Cd batteries at once, with automatic current control for safe and efficient charging. Equipped with LED indicators for charge status, the charger offers protection against overcharging, overheating, short circuits, and reverse polarity. The included batteries feature low self-discharge, retaining power for months, making this set ideal for high-drain devices like cameras, toys, flashlights, remotes, and gaming controllers.