If your battery is no longer charging, replace it with an extra from your repair kit. These instructions will help guide you.
1. Turn the laptop upside-down, with the handle facing away from you.
2. Pull the lock tabs towards the green outer edges of the laptop. Hold the left lock tab in the unlock position until the battery is completely removed in the next step.
3. Hold the left lock tab in the unlock position until the battery is completely removed in the next step.
4. Lift up on the middle of the battery to remove it from the device.
You've done it! To put your new battery back in just follow the instructions in reverse.