inputs.text: awesome rechargeable power - purchased imax power imp500 researching several external power packsi needed portable power large enough reserve charge iphone 3gs without plugging ac outlet imp500 monster took conventionin boston able charge iphone several times loaned friendand recharged iphone still 3 bars power meter used itthe whole week never recharge power pack compact light full reservepower device every bit 5 stars great delivery amazon high recommended