You know, this grip affair has been too much excitement for me. I just contacted Amazon to see about getting a refund. It is over the 30-day limit, but I explained that the problem with batteries wasn't obvious at first.
As much as I hate to spend more on camera gear, there are a few genuine MB-D11s for sale on eBay. Selling for about 70% of the new retail price. One even comes with a spare EN EL 15 battery. The peace of mind would be worth the extra $90. Who wants to run out of battery power during an important shooting session?