It's kinda like you have a bucket you carry around you for drinking water. And you get back home, your bucket is about empty, and you have 3 seconds to get wate

It's kinda like you have a bucket you carry around you for drinking water. And you get back home, your bucket is about empty, and you have 3 seconds to get water before you need to leave and you're like "Let me fill up my glass instead and then slowly pour it into my bucket". Your glass will be full, but it wouldn't make a dent in you bucket, and frankly if you were to carry around a glass of neccesairy size to fill up your bucket to even 20%, you could just carry another bucket around. It's a really bad metaphor for supercapacitors having worse energy densities than for example lithium ion batteries, and that having a supercapacitor large enough to recharge your battery to 10% would esentially entail carrying around another battery. Honestly, if you have a phone you can actually open, you'd be better advised with an exchange battery, and if you can't open it, an external battery pack you carry around for emergencies like this. For example, I think this external charger might do what you want it to do http://www.amazon.com/Energizer-Energi-To-Go-Battery-Operated-Instant/dp/B000IOKLZM http://www.amazon.com/Energizer-Energi-To-Go-Battery-Operate... but your requirements might differ.