Feature: Shelf life: within 5 years Standby time: 2 days Talk time: 1-2 hour Type of Battery: 4pcs CR2450(included) Card Style, easy to carry This is a pre-charged self contained battery and not a recharger. Simply plugs straight into the bottom of your mobile phone. use only when your mobile battery is signalling low battery alert to extend your mobile standby time.It can be re-used several times until battery is drained completely.