inputs.text: trent imp1000 power pack - purchased backup power supply iphone3gs navigation apps use lots power need phone operate whole day no power outlet available power pack perfect solution small light weight fits easily pocket used recharge phone onthego power pack arrived partly charged used charge phone ran completely followed instructions let charge fully pilot light went 5 six hours used fully charged power pack charge iphone exclusively able complete 5 fullcycle charges phone provides enough power operate phone continuously day power spare great product