Now you can make sure you have a spare battery fully charged while you continue to use your BlackBerry Curve 8900, Storm, Thunder device, or just add in a USB cable to charge your device and your spare at the same time. Use the Mini Extra Battery Charger with any BlackBerry car or wall charger to power up a spare battery in your car, in your home or office, or right off your computer. You'll have the security of knowing your extra battery is charged and ready whenever you need it.