Morandir835, Yes they are all autos. I have occasionally experienced leaking due to overfilling a cart. When it gargles I disconnect and clear it. I have one tank that seems to leak. I don't know why, I don't use it anymore.
The difference in a cell phone is it gives you plenty of warning before the bat is depleted to a point of damage. Therefore you may know a full day before that you need to put it on a charger.