Replacement 4400mAh Laptop Battery VGP-BPL2C for SONY VAIO PCG-6C1N VGN-AR21B

After a while of use, it will become unreliable and unable to hold a charge like it used to when it was brand new. So the life span of it will decease. After a long time use, you need a new one.

When you first got your new laptop and battery, the work time is different from the performace your battery play now. full charge the laptop battery and compare with the work time, if it is over half of the new one, you should change it. for most battery can be normal used in 400-500 charge and discharge circles.

The best you can do is to take the battery off every time it's fully charged and you are in a place where you can keep the laptop plugged to the wall.

Charging you battery when it's half empty won't damage the battery itself but will make you run thru cycles twice faster, thus, it will kill your battery twice faster.

Never, never, keep the laptop plugged in with the battery in fully charged for a long period of time. This is the mistake most people make, it prematurely kills the battery.

Also, never keep the battery empty for a long period of time like a week or so. Lithium ion batteries don't like to be left discharged for a long period of time.