That you might forget your battery-pack at home and your mobile is flat, this is the best Plan V for you. Plan V is one of the hottest campaigns that are funded more than 200% in almost half time. It’s not just another battery back-up that weighs as much as you smartphone and requires more space in your pocket. Plan V is a lightweight (7g) failsafe device that works both as a keychain and a charger. All you need is a 9-volt battery which is easily available in stores. Do you feel more lighter now? Of course, just flip open your keychain, connect to your smartphone (it has a Micro USB connector), plugin a 9-volt battery onto it and juuice-up your mobile on the go. And, here you go to buy it!

Available at for $13+