After a year and a half of good use of my D800 and MB-D12 grip, the later just stopped working.
In fact, all the buttons are working fine, but the inside battery is not seen by the D800.
This is happening whichever battery I use (i have 3) or even the AA battery holder.
Of course i'm out of the one year warranty and Nikon is asking me 275$ for repair...
I did some testing and I'm sur it is a 0.5$ voltage regulator or diod problem, but I can't find the electornic card alone as spare part.
I'm about to buy a cheap 35$ new grip on ebay but I'm wondering if any of you have an idea of the problem or solution ?
I hate not beeing able to repair things.
Also, seeing the difference price between the Nikon and any other brand, and the lack of longevity, this is definitely the LAST time I buy such addons from Nikon.