I do use a separate charger--the one that came with the two Wasabi batteries that I got. I think one of those batteries is just a bad unit. I know that over time, even with the camera turned off, the battery will lose some charge, but it's never been like this. When I discovered I'd put the Wasabi battery in, I figured I just had one bad battery. It would be nice if the new batteries for the A7iii would fit and work in the A6xxx series cameras. Now, if the freshly charged OEM Sony battery does the same thing, then I'll know the camera is suspect. If not, then I'll consider buying a couple new Sony batteries.

It looks like your Sony batt test showed the same 'stair-step' behavior, though not as dranatic as in my test. Wonder what kind of batt technology Sony employs to get that. Imagine the sort of confusion you might get. The batt is just got on a step and you switch on and fire a bunch of shots and get a small battery drain and you think 'what a great batt why carry all them spares.' Next week the batt has been an a step awhile, you switch on and fire one shot and the batt takes a stair and you think 'crap where are those spares, this is (deleted)'

This is for any Sony A6300 owners who may experience this issue. I've noticed that this camera drains the battery quickly. I was out yesterday and started with a fully charged battery. I was out for less than an hour and took no more than 6 images, and the Sony battery was down to 6%! What's the deal here? I looked up some YouTube's on the subject and all I could come up with is that the sensor that switches between the EVF and the rear LCD screen accounts for some battery drain, but not all of it. So, while my Sony battery is on the charger (I did charge it up yesterday, but by this morning it was down to 90%) I put in one of my spare Wasabi batteries, turned the camera on and it showed 100%. But after looking at the menu for a few minutes and playing with EVF focus adjustment, I found that the battery was down to 87% after less than 5 minutes of the camera being on. This is frustrating, to say the least. Does anyone have any suggestions or a "fix" for this? Thanks in advance for any good advice or information. If this is a serious problem with this camera, and it can't be fixed, I'll ditch it for something else. Hopefully it won't come to that.

Greg, I've had the a6000, since April of 2014, and the RX100III, since May of 2016 (the pocket camera is my EDC). I've not read all the replies to your plight, but I'll mention that cool weather seems to discharge the Wasabi batteries much quicker than the OEM's ~ especially the tiny Wasabi batteries that power the RX100III; they'll discharge very quickly, even when the camera is off. You might take note of the OS temps in your part of the country. _Van

Edit: I like compact mirrorless cameras so much, I've just resigned myself to carrying 2-3 extra batteries at all times, and watching to make sure the battery in the camera has not discharged, while idle.