inputs.text: backup battery need - im somewhat preparedness freak saw couple external portable usb chargers come market little research found gem recently upgraded larger version new trent one served well continues serve fiance well whenever needs hurricane sandy communication life saver would not able stay touch family friends without charged work used keep phone ready go case emergency keep contact displaced family members worked like charm never failed buy new trent anytime want expand replace portable charging capabilities would recommend new trent charger anyone feels like might need juice times emergency