Nobody plans to fail, but a lot of us fail to plan. Keeping an extra battery, charged and handy, is a good plan anytime. Long flights and longer meetings, power blackouts and transit snarls - an extra battery gives you the power to keep on communicating, come what may. Only genuine BlackBerry® smartphone batteries work best with your device, holding their charge longer and taking the maximum number of charges over their lifetime. That's why your battery features a cryptographic chip to assure you it's genuine.
[Source : BlackBerry