Can you use an iPad battery with an Arduino?
Are the batteries protected? Are their overcharge/low voltage cutoffs implemented in circuitry inside the battery which would mean they can be safely used outside of an iPad?


Apple doesn't share technical specs or datasheets on their devices. You are in a better place than most since you can get them cheap and easily. Unless you take one apart, or your suppliers share some data on them, noone knows. Also, beware of those cheap chinese knockoffs. Who knows what shortcuts are taken on them. Apple prices means Apple quality. 10 dollar prices mean 2 dollar quality. You are probably not getting legit 11000mAh batteries at that price point.


  Is the fact that the iPad 3/4 battery contains multiple cells going to cause problems with load balancing during use and charging? If this is a problem, the iPad mini contains just one cell and so may be a viable alternative.


Assuming they follow Apple specs, Apple undoubtedly takes load balancing into account. But a single cell is easier since it doesn't require that.