There are times when you would like to configure when low battery or critical battery notification should appear in windows 7,Windows warns you when your battery charge reaches low, reserve, and critical levels. When the charge gets low, the battery icon in the notification area indicates a low-battery level.
When your battery charge reaches the reserve level, Windows notifies you that you’re running on reserve power. At that point, you need to save your work, and then find an alternate power source or stop using the computer. When your battery is almost out of power, the battery icon indicates a critical-battery level, and then your laptop goes into hibernation.
If you don’t have enough time to act after seeing the low and reserve battery notifications, you can increase the percentage of battery remaining for these settings. This can be especially useful for older batteries, which might not have as much storage capacity.
Follow the procedure below to turn of or change low, critical battery level alert and level when it should alert.
1. Open Start menu, type power options and select power options as shown in the image below.
2. Under Power options for the type of power plan already selected, click Change Plan Settings as shown in the image below.
3. Now click Advanced power settings as shown in the image below.
4. Under advanced power settings scroll down, open the submenu under Battery on the bottom of all the power options.
As shown in the screenshot above you can change, turn off low battery notification in windows 7 and the reserve battery level, low battery level and you can also configure low battery notification and action it should take like whether windows should hibernate, sleep or shutdown so that you can avoid losing your work.