... out Internal Battery type: Li-polymer battery cell MP 5000 universal power bank for laptop,mobile phone external batteryFeature:1. High ... .Can charge mobile phone or ipod or MP3/4 at the same time .4.High security :protection for overcharger, overdischarge,overload, ... .Can charge mobile phone or ipod or MP3/4 at the same time .4.High security :protection for overcharger, overdischarge,overload, ...