As far as 808s go, if you're running low on battery, you probably have an old batter. Whether they are used or not, if they sit around for three months or so, they start to degrade. Some are faster than others, and many factors contribute to this. It's not necessarily a bad manufacturer. Laptop batteries are the same way. I, my mom, and my grandma have all used them for over a year, and the bats don't bother us at all. I'm just sick of the carts. If you have a passthrough, you can plug them into one of those portable usb chargers. I keep a solio.com solar charger in my backpack at all times. You can even use a hub, and charge one bat while you use the pass through. bats also seem to charge faster on this for some reason. YMMV.