Nobody plans to fail, but a lot of people 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. The 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.