MaximalPower 9 Volt / 9V battery and charger combo pack is a value combo set of two 9 volt li-ion rechargebale batteries and one 9V dual channel battery charger with LED light indicator. 9 Volt Li-ion Rechargeable Battery - MaximalPower 9 Volt rechargeable battery is li-ion replacement battery for all standard 9V battery and can be charged by 9V li-ion charger. It is reliable, reusable and renewable to reduce waste and save the planet. The battery requires 3 to 5 charges and discharges before achieving its maximum capacity. The battery life depends on the type of device or the accessory used and the temperature of the environment stored. 9V li-ion battery needs to be charged with 9V li-ion charger only. 9V Li-ion Battery Charger - Charging Current: 100mA per channel. Dual Channel: Two 9V li-ion batteries can be charged at the same time. LED Light Indicator: Charging - LED light turns red, Fully charged - LED light turns green.