... solar emergency charger, with built in high capacity rechargeable lithium polymer battery, can be used anytime on your mobile ... 0.8W 3) The built in high capacity rechargeable lithium battery. (900mAh or more, different models optionable match the lithium batteries of ... different specifications) 4) Output voltage: 3.7V, 4.2V, 5.5V, 9V ...