Groupon Goods has the Prolix Power External Protective Battery Case for iPhone 5/5s for $34.99 + FREE shipping!

Why this deal is hot:
Save 50% off -- that's $35 in savings!

What this does and why you need it:
The 2400mAh capacity doubles battery life for those moments when you forget to bring along a charger. There is an LED power indicator, lightning output port, Micro USB input port and it comes in multiple colors (iPhone not included)!