Re: Note 2 wont charge
A voltmeter will do the same thing.
From a Sprint Moto X using AC forums app
Actually, yes, spinning the battery can be at least one way of determining if it's swollen; and, yes, it does work for at least that purpose... mostly. But it's far from the best way; and is mostly unnecessary, in any case. Moreover, it cannot necessarily tell if the battery's bad since even a battery that isn't swollen may nevertheless still be bad... and, actually, vice versa, truth be known. That said, yes, if a battery's swollen, then it should be replaced, just as a matter of good practice, no matter what.
Any not-swollen battery will lie completely flat, on both sides, on any (likely table or desk) flat surface. And by "flat," I mean that one should not be able to "rock" the battery, as if on a fulcrum, by pressing on any corner or side of the battery, when lying flat on either of its sides, and assuming that the table or desk on which it's lying is dead flat, itself. The reason spinning is a kind of nice way of doing it is that it can reveal a swollen spot even if the underlying table or desk isn't dead flat, itself; but all it shows is if the battery's swollen, which may or may not also mean that it's bad (though, again, if it's swollen, it should be replaced, regardless).
The only true way to determine if a battery's bad is to put it on a tester that's made for it, and which tests it under load. Most carrier device support centers (and, of course, Samsung; and any Samsung-authorized repair/refurbishment center; and many independent repair centers have such battery testing equipment (though I've seen several of their technicians nevertheless insensibly using the spinning method).
A voltmeter will do the same thing.
From a Sprint Moto X using AC forums app