I have two original W126S batteries for my X-T2 and for some reason I find the percentage reading unreliable. Before I dig further I'll just mention that each battery has gone through 3-4 recharging cycles already and it doesn't seem to improve so I wonder if something is wrong with either the body (more likely) or the batteries (less likely). Here's the thing, I put a fully recharged battery in camera, I turn it on, check the percentage reading which is 100%, use it 'till it drops to 98-99%, turn it off, turn it on again, check the reading, shows 92%. Using it' till it reaches 88%, turning it off and back on again, boom - 84%. So on and so forth. As mentioned earlier, it happens with both batteries, which were already charged for few times and the readings keep to drop sudden 2-7% after each using period (few minutes, usually). The batteries don't seem to lose their charge while stored inside the camera (while it's turned off) for more than a day or so, but these drops make this whole thing quite unreliable in my opinion.