Groupon has the pre-order PRESS PLAY Switch Apple-Certified 3,100mAh Battery Case for iPhone 6 that is on sale for just $39.99 + FREE shipping!

Why this deal is hot:
Save 60% off -- that's $60.00 in savings!

What this does and why you need it:
This ultra-thin case comes with a built-in external battery to nearly double the battery life of the iPhone 6 (iPhone is NOT included). It is rechargeable at a 3,100mAh capacity and can add up to 8 hours of talk, 8 hours of web browsing or 255 hours of standby time. The case supports pass-through charging and syncing, has an interchangeable clack and clear frame and LED power indicator. It also features speaker ports, an on/off switch, access to all phone ports, is MFi-certified by Apply and has a one-year limited warranty. The case is available black, silver and gold.