I know that its been said before in an episode that LTT doesn't review power banks, because realistically a battery is a battery one way or another, and I certainly agree! From one to another battery banks are largely the same sorta thing with a little change in how much juice they actually have and how much they cost. However I also know that LTT loves to go overboard! I thought to myself just on a whim after I had visited the power tools section of my friendly neighbourhood hardware store picking up a cordless jigsaw and the enormous battery it comes with that 'this battery is bigger than the one in my old gaming laptop'. I'm sure wherever you are in the world you've seen these newfangled 'universal cordless tool systems' of which dozens of different tools in a range are designed to fit the same battery shape. The range which I bought from is the Ryobi One+ system http://www.ryobi.com.au/power-tools/products/list/family/one-plus which is an Australian exclusive brand but DeWALT RX18V series is basically the same thing. Batteries in the 18V One+ range begin at a meagre 1.3Ah and scale all the way up to a massive 5.0Ah capacity! Like many similar cordless power tool systems they also have a large number of modules that have more 'utility' purposes like radios, torches, pumps. shop lights and fans. What really prompted me to think about this is a USB charge adapter module for the One+ system which allows you to charge USB devices from the enormous power tool battery pack, effectively turning those huge power tool batteries into power banks for your phone or tablet! http://www.ryobi.com.au/products/details/18v-one-usb-power-adapter I try to make my idea a little more interesting with a bit of story time because there isn't really any underlying point to my thoughts here. I'm not even sure anyone here would care about the prospect of giant power banks but everyone I've spoken to about it thinks its an epic idea! Who would need such a massive power bank? The idea in my head just seemed 'LTT silly'. Has this idea crossed someone elces mind? Maybe someone out there actually might need a huge power bank. The website says 6 full phone charges with a 5Ah cell. I'm not even sure that's true, that seems like a whole lot of zap! You could power plenty of stuff with just a couple of these.