Apple today introduced the new iPhone Smart Battery Case for the iPhone 6s and iPhone 6. Available in White or Charcoal Gray, the Smart Battery Case includes a built-in battery which will boost your iPhone's battery life for talk time up to 25 hours and internet use up to 18 hours on LTE.
You charge the Smart Battery Case and your iPhone simultaneously and the amount of charge left in the case is displayed on your iPhone's normal battery indicator.
The Smart Battery Case is available to purchase from today for $99. The case's exterior is silicone whilst the interior is a soft microfiber lining. It also features a "soft elastomer hinge design", which Apple claims will make it easy to put the case on an iPhone and take it off.
For the time being, the Smart Battery Case is only available on the 4.7" iPhone 6 and iPhone 6s, it is not available for the iPhone 6s Plus or iPhone 6 Plus.