Offered in Lightning ($90) or Dock Connector ($75) versions, Tylt's PowerPlant is a standalone rechargeable battery pack for iPhone and iPod users. The glossy hard plastic body includes a flip-open soft rubber panel with a USB port for device-agnostic charging, as well as an integrated fold-out cable with either a Lightning or 30-pin connector at the end. Four green LEDs indicate the current power status of the battery, which is refueled with an included…