Battery extenders are nothing new. There are plenty of powerful ones available for iPhone and Android devices. You certainly wouldn’t want to carry a bulky battery extender everywhere you go though. The KERO Power Annex can be just what you need. It is a slim profile external battery that attaches to the back of your phone to give it up to 75% boost in charge. It has a 1800 mAh battery and can be attached/removed to/from your phone easily.
The Power Annex does not make your phone feel sticky, nor does it take a whole lot of space. It has a LED charge indicator that that turns solid green when the device is 75-100% charged. You can recharge your Power Annex via a USB cable. This product is on Kickstarter right now.
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