Designed exclusively for the HP Compaq HSTNN-IB79 battery part number, this original HP 12-Cell extended capacity battery sold by Everyday BatteryTM is your answer to all your mobile computing needs while you are on the go. Maximize your battery life for more games, videos, music, and photo viewing without having to plug in your AC adapter. An additional 12-cell battery doubles your battery part number's capacity compared with the power you get from a standard 6-cell battery. Recharge whether your battery part number is on or off. It offers up to 8 hours battery life. Check your battery charge with the new fuel gauge. Plug in your battery to AC adapter port to recharge. The completely redesigned shell casing from a newly-engineered mould along with an overhaul of the internal electronics of this new battery model make this unit offer a lot more in terms of battery power, ease of fit and visual aesthetics over the old models still on the market.