When using the battery, don’t leave the adapter connected for too long. It has the potential to harm the battery. To bring the new battery to its full capacity, discharge it to 5% (not 0%), then charge and cycle it 3-4 times. To extend battery life, complete a full discharge charge every other month. Each battery has undergone factory testing and is brand new from the manufacturer. Grade A cells assure quick charging and low power consumption, and built-in circuit protection ensures both safety and stability. CE, FCC, and Rohs certifications For safety, certification is required.