This is a brand new Acer AP21D8M battery for select Acer Nitro 5 AN51 models.

This Acer AP21D8M battery is typically superior to the original battery and is 100% compatible with your Acer Aspire notebook computer. 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 AP21D8M battery when new. Even longer run time can be achieved by minimizing your screen brightness and energy use.