Brand new replacement HP Mini 311 battery must be fully charged with over 8-12 hours for the first time use,and the first 3 charge cycles are very importantly for get max performance. Do not try to modify or disassemble the Mini 311 battery pack because this may cause damage to it. If it is using the external power supply for long time,please remove the replacement HP Mini 311 battery from your laptop,this can increase battery life. It is normal for a battery to become warm during charging and discharging.If the replacement HP Mini 311 laptop battery is not going to be used,please to store the battery in a cool,dry and clean place. If the replacement HP Mini 311 laptop battery can't work fine, please check twice to confirm that the battery is defective or not, and contact our customer service representative ASAP, let us know the Detailed Problem, we will do our best to serve you.