Lenovo 3000 N200 Notebook - Manual (Page 36)

4. Unlock the battery latch by sliding it to the unlocked position, and while
holding it in the position remove the battery.
14.1-inch screen models: 15.4-inch screen models:
5. Install a new battery.
14.1-inch screen models: 15.4-inch screen models:
Replacing the battery
26 Lenovo 3000 N200 Service and Troubleshooting Guide