10.8V 55Wh 6CELL

6 Cell Li-ion 10.8V 4.4Ah 

EliteBook 8460p, 8460w, 8470p, 8470w, 8560p, 8670p, 8570w 
ProBook 4330s, 4331s, 4430s, 4431s, 6360b, 6460b, 6465b, 6470b, 6475b, 6560b, 6565b, 6570b 

Your new battery comes in a discharged condition and must be charged before use. 
Upon initial use (or after prolonged storage period) the battery may require two to three charge/discharge cycles before achieving maximum capacity. 
If the battery is not going to be used for more than a month, it is recommended that it is removed from the device and stored in a cool, dry, clean place. 
It is normal for a battery to become warm during charging and discharging. 
A charged battery will eventually lose its charge if unused, it may therefore be necessary to recharge the battery after a storage period.