This 9V battery is rechargeable， lithium-ion type is rechargeable , cycle life more than 300 times, features low self-discharge. no memory effect. MAXLITHIUM 9 volt rechargeable battery real capacity up to 800mAh, at least 2 times of regular alkalkine battery and 3 times of NiMH battery, lasting time siignificantly increased , It's the ideal alternative for single use 9v batteries and NiMH battery, especially economical for high frequently used devices , It would significantly decrease waste and pollution to our environment. The related USB charger for 9v rechargeable battery is easy to connect with any DC5V USB outlet, such as wall chargers, power bank USB port, car chargers. Less than 2hrs to fully charge 3 batteries, The charger with low heating loss during charging process. The 9v battery rechargeable pack including:3 x 9V Rechargeable Batteries Lithium-ion; 1x 3-slot 9v Battery Charger, 1x usb Charger cable. Warranty 2 years