Replacement Battery Part No. HP:
HP

412789-001 484784-001

EH768UT HSTNN-XB21

HSTNN-XB22 HSTNN-XB23

KU529AA

HP COMPAQ

404887-241 404888-241 411126-001 411127-001

412779-001 441675-001 EH767AA EH768AA

HSTNN-DB22 HSTNN-DB23 HSTNN-FB21 HSTNN-XB21

HSTNN-XB22 HSTNN-XB23 RW556AA

Replacement Laptop Machine Part No. HP:
HP

2533t

EliteBook 2530p

EliteBook 2540p

HP COMPAQ

Business Notebook 2400 Series

Business Notebook 2510p

Business Notebook nc2400

Make your HP HSTNN XB21 battery last longer:

1. Should I totally discharge and recharge my HP HSTNN XB21 battery occasionally to make it last longer?
   A: No, discharging and charging does not increase the life of a Li-ion HP HSTNN XB21. And with current Li-ion batteries this practice does not improve the runtime of the battery. This practice is a holdover from the days in which batteries were used.
2. How do I get the most runtime for a charge?
   A: It is important to choose settings which allow you to obtain the most runtime from your notebook. Examples to consider: timeout settings for the hard drive, Bluetooth, wireless, LCD brightness, etc.
3. Will my HP HSTNN XB21 battery become useless if I leave it unused for a long time?
   A: Basically, yes. We suggest you to charge or discharge the HP HSTNN XB21 laptop battery to 40 - 60% capacity using your Windows operating system power meter, then remove it from your system. Then Store it in a standard office environment, away from extreme temperatures. However, fully charge and remove battery from HP HSTNN XB21 laptop before leave it unused for a month or longer. It's better to use your battery at least once a week for keeping it works well.
4. What is the best temperature for battery storage?
   A: Because very hot or cold conditions could affect a battery's performance,you'd better store the HP HSTNN XB21 in a place with recommended storage temperature of 15°C (59°F).