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17 Aug, 2016
Surprisingly robust.
1 of 1 found this helpful I bought these with zero expectations, well, more like expectations of something bad happening.
The batteries look a little worn out, but after many charge cycles, the warping has been almost nonexistent, and there have been no severe cases of severe overheating (that haven't been caused by my phone itself). Even in cases of high heat, the battery has held strong and not warped.
Battery life seems OK, there has been no rapid deterioration.