Battery Life
Fitted with a removable 600 mAh Li-Ion battery, the C21 grants reasonable endurance for a feature phone. It promises standby time of up to 180 hours and talk time of up to 3 hours, which should suffice for users who utilize the phone mainly for calls and messages throughout the day. The removable nature of the battery adds convenience, allowing users to carry a spare for extended periods away from power sources.