We featured a tiny power bank that can be attached to your keychain. But if you need a relatedly large battery capacity, the TravelCard credit card-sized backup battery may be more suitable for you.
The TravelCard is an easy-to-carry power bank that measures 3.38 x 2.13 x 3/16 inches and weights 2 oz. As we can see from the images, the backup battery features gorgeous minimalistic design, and its ultra-slim, credit card-sized body lets you easily put TravelCard in your wallet, pocket or bag, while its lightweight aircraft grade aluminum casing provide premium and stylish look and reliable protection for internal components. Moreover, the built-in 1300mAh rechargeable battery offers your smartphone extra 5 hours of talk time or 98 hours of standby time.
At present the team of TravelCard is raising fund at Kickstarter. Pledging $40 will let you own a TravelCard backup battery with Lightning connector or microUSB connector. If you’re interested, jump to Kickstarter official site for more details.