There’s a lot of external batteries on the market, and they all try to stand out from one another in some way or other. The BOLT Portable Battery Backup & Wall Charger Combo does it by not just being a battery, but also a charger itself. This means you plug it into the wall, then connect a USB cable to it and charge your mobile device like you normally would. Then, when you’re ready to go, leave with the BOLT as well and use that as a spare 3,000 mAh battery. So instead of using up two wall outlets (one for your battery and one for your phone) you can just use one. It’s normally $60, but with today’s deal you’ll pay $45.