I have an imported-from-USA D300 which comes with a Japan EN-EL3e. That works perfectly fine, in fact, I have only charged it once so far and shot over 2000 frames (but I also use the MB-D10 grip)
I bought another EN-EL3e from Malaysia (my usual shop, Mee Too photo at Jusco Tebrau) which is Made in China. Charged it, stored it, and forgot about it.
Yesterday, I decided to swop the China battery to my main body and use my Japan battery in the battery grip, as I was charging my AA batts for the grip. The china battery registered low batt (unable to operate camera at all)
I tried the china batt in the grip, same issue. In fact, with china batt in the grip and japan batt in the body, it will still show low batt. Likewise for Japan batt in grip and china batt in body.
Take off the grip, insert japan batt, no problems. battery still about 70%.
The obvious way to go about doing this is to take the batt back to the shop and ask for replacement, and yes, I will do it on my next trip to JB.
However, I'd just wanna check whether any other brothers n sisters here have had such issues. I searched "EN-EL3e" on CS and google and didn't manage to find other similar problems though there were other D300/en-el3e issues