This Information was pulled from the HP website, but most of the information is relevant to all modern Notebook Lion batteries.
Store Li-Ion batteries between 20°C and 25°C (68°F and 77°F) with 30% to 50% charge.
Do not disassemble, crush, or puncture a battery; do not short the external contacts on a battery; and, do not dispose of a battery in fire or water.
Do not leave batteries exposed to high temperatures for extended periods. Prolonged exposure to heat (for example, inside a hot car) will accelerate the deterioration of Li-Ion cells.
Remove the battery if the notebook will be stored (turned off and not plugged into AC power) for more than 2 weeks.
Remove the battery from the notebook if the notebook will be plugged into AC power continuously (via a wall adapter or docking station) for more than 2 weeks.
Use the type of battery with the highest capacity (Ah) rating if the notebook will run high-end applications on battery power.
Calibrate the battery based on the usage model. Under normal usage, batteries should be calibrated a minimum of once every 3 months; however, a battery that is rarely discharged fully should be calibrated about once a month
Factors that contribute to loss of battery capacity
Li-Ion battery cells suffer gradual, irreversible capacity loss with each discharge-charge cycle. Such aging occurs more rapidly as temperature and discharge loads increase.
The self-discharge rate of a Li-Ion battery is higher if the battery is left in an unpowered notebook.
During prolonged storage or non-use, the battery charge will decrease below its recommended low-voltage level.
Leaving the battery in a depleted condition for an extended period accelerates the decrease in full charge capacity.
Leaving the battery at a high level of charge in a high-temperature environment for extended periods (for example, running a notebook computer in a docking station under a heavy load) also accelerates the loss of capacity.
Running high-end applications using the battery accelerates the loss of capacity. For example, playing 3D games lowers full charge capacity faster than using word processing applications.
Source of Information