PB995A - Original HP Presario C300, C500, M2000, V2000, V4000, Pavilion dv1000, dv4000, dv5000 Series 12-Cell High Capacity Laptop Battery
Want maximum battery life so you, friends, and family can keep playing games, watching videos, listening to music, or viewing photo slide shows without having to plug in your AC adapter? Here's the answer: the 12-cell, 8.8 Amp Hours Li-Ion battery.

Double your notebook usage time without requiring use of AC power
Work longer than with other types of batteries: the 12-cell Li-Ion teams with your notebook's power-management features to reduce power consumption
Recharge your notebook—whether it's on or off—using your AC adapter
Continually charge the battery to full capacity if it isn't completely charged