If your battery runs out on your Blackberry you re out of touch. However if you ve got a spare charged battery in your bag you can keep on working. With this spare battery you can keep on working even if you re not near a power supply. You never know when your flight is going to be delayed or your travel plans disrupted. Prepare by buying a Genuine BlackBerry 8800 Series Spare Battery. Offers long lasting rechargable power for all 8800 series BlackBerry Devices. The CX2 provides 1400mAh of power.