These safety instructions must be read carefully and fully understood before attempting to use your laptop battery.
1. let the power of the ACER TRAVELMATE 521 batteries (15%) drain to 0% When you use your brand new Battery first time. And then full charge it(usually charge it full 12 hours) and let it drain to 0% again. Do this for 2~3 cycles.
2. If you have a nickel-metal hydride battery, completely drain and recharge the ACER TRAVELMATE 521 laptop battery once a month to maximize its capacity to hold a charge.
3. Don't leave your computer plugged in constantly when it is not in use. If your computer always relies on this power, it will loose its ability to last long on its own. So always charge your computer when the ACER TRAVELMATE 521 battery is almost dead and then unplug it from the wall.
4. If you have two or more battery pack of ACER TRAVELMATE 521, it's wise to discharge and then fully charge it on battery power once a week or so, just to keep the battery fresh conditions.
5. Keep it cool. Do not expose the ACER TRAVELMATE 521 battery to high heat or freezing temperatures. Do not leave your battery in your car in the summer. Hot batteries discharge very quickly, and cold ones can't create as much power.Overheat is damaging harmful for you laptop battery, so it is wise to remove the Battery from a laptop when it has been fully charged.
6. If you do not use your acer laptop for extended periods of time (a week or more), remove the ACER TRAVELMATE 521 battery pack from the laptop .

+ We wholeheartedly offer the best service to our customers .
+ New: A brand-new, unused, unopened, undamaged item in its original packaging
+ 1 year warranty! 30 days money back! we offer cheap ACER TRAVELMATE 521 batteries have been made of Safe and Powerful Cells
+ Distributor and wholesaler of high quality and low price laptop batteries
+ This ACER TRAVELMATE 521 notebook battery has been tested and validated on asus systems to ensure it will work with your notebook .
+ Have a complete engineering facility for battery pack testing. This enable us to provide the most up-to-date in battery pack testing for the most advanced portable consumer electronics products. We only sell quality products from quality suppliers
+ Have over 5,000 pieces of different batteries in stock .

a. Price - We offer replacement ACER laptop Battery for ACER TRAVELMATE 521 at low price.
b. Condition - This battery is Brand New, 100% OEM compatible!
c. Quality - 100% compatible with original ACER TRAVELMATE 521.
d. Construction - This battery uses the highest quality cells.
e. Warranty - One year quality assurance for Li-Ion battery, 30 days money back.