My 2012 N7's battery life has decreased quite a lot over time so I bought a new, unused replacement battery off eBay from a reputable seller with lots of positive feedback.

But... it seems like the replacement battery drains faster than my old battery. O.o How can the new battery be worse? My only explanation is that it was exposed to heat during shipping or something, but I stuck it in the fridge before replacing it... Does anyone know what the problem could be?

This is where I bought it from:


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