We brought two of Avery Chromebook 311 Spin CP311 First week Dec 2020. As of the last week of July 2021 both computer batteries died within 5 days of each other. We thought it might been both charger. So we purchased new chargers. Both chargers worked on one computer but only if it was on the charger for more than 7 hours. A computer Tech said both Batteries are completely dead. This battery is not replaceable thru ACER you have to order online and they ship from oversee. It will take1.5 months to receive a battery.  Battery cost $89. Do not buy.