I had purchased a pair of the prior model batteries in mid December 2009 planning on giving them as xmas gifts. I knew at the time that they were out of stock but were expecting stock before xmas so I ponied up for 2nd day shipping and gambled that they got here on time. Well, I lost the bet, I thought! I received an email from MDD support after xmas stating that the batteries that I ordered were no longer available, and were being replaced by another manufacturers batteries. I was given the option of canceling the order, I declined and took my chances with the new, no track record, no forum feedback batteries, having been in the computer industry for over 40 years I am used to being a pioneer, also having dealt with MyDigitalDiscount since 2008 I knew if I had any problems they would be taken care of promptly. The new battery (yes, only one battery) arrived on Tuesday January 5th, I promptly called MDD, and the phone was quickly answered by Chris, (forgive me if I got the name wrong, it has been a rough year) he was extremely courteous, and highly knowledgeable, he apologized for my order being short and assured me another battery would ship out that afternoon. I asked him about the battery working with Mini9's running OSX, and the BIOS problem the previous battery had. He assured me that he had personally tested the new battery on a Mini9 running OSX and the newest BIOS and there was absolutely no problems! This was quite a refreshing change from the vendors out there that sell untested products, have phone menu tree hell and hire high school kids to provide tech support. There are Macintosh vendors out there that should start emulating MDD's high level of service. Over a week into 24/7 service with these batteries, I am completely satisfied by the product, and service provided by MDD, from the incredible RunCores, to the new batteries and the stellar service, I couldn't be more satisfied. My biggest vote for the batteries and the vendor is that I will be ordering at least two more batteries, probably more within a week.