Battery draining very fast

You can try GSam Battery Monitor and System Panel Lite. These apps should give you a good idea where the juice is being used.
How old is the battery, is it original? Have you inspected it for swelling which is a sure sign that it's done?

 

The spin test just sees if there is a bulge. The battery should be flat, hence won't spin.

I'd say your battery is just old. Normally they're good for just 1 or 2 year use.

 

Yes if the battery spins on a flat surface that means it's somewhat swollen. It should be perfectly flat. This test is just an alternate way to confirm a slight swelling when it isn't bad enough to be really obvious. Any amount of swelling is bad and the battery should be replaced at the earliest opportunity, for both battery life and safety reasons.
At 2-3 years old and presumably a whole lot of charge/discharge cycles I'd say that battery has completed its expected life cycle.

 

The second a battery is pulled off the manufacturing line it's already begun very slowly dying, it's just what they do. They were never designed to last forever. Batteries go bad over time, all the time without showing signs of swelling. The spinning is just ONE way of possibly determining a bad battery. The fact that you got two years out of it is pretty impressive. I got a solid 11 months out of mine before I began to notice a more rapid rate of discharge. The good thing is they're cheap to replace just take a look on Amazon.