This is a brand new Acer AP18K4K battery for the Acer Chromebook 311 and Chromebook Spin 311 models. This battery is compatible with the Acer Chromebook 311 C721, CB311, C733T, and R721 models. It also replaces the battery part numbers. Additional compatible models and battery part numbers are listed below.

This AP18K4K battery is rated 11.4 volts and 44 Whr and will normally last 4-6 hours on a full charge. You can get longer battery life by dimming your screen and closing unused programs and applications.

This Acer AP18K4K battery is typically superior to the original battery and is 100% compatible with your Acer Chromebook laptop. Each battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty.

You can expect about 6 hours of run time with this Acer AP18K4K battery when new. Even longer run time can be achieved by minimizing your screen brightness and energy use.