@josch has a thread where he did a battery replacement he documented here:
I’ve used exactly the same batteries and had good success. I think the biggest problem is that the batteries themselves are larger than stock, so you end up removing the battery holder brackets, and at least in my case they’re just wedged in there and held in with kaptan tape. Seems to be working okay, though.
Mine didn’t come with JST plugs installed, so I had to source some and attach them myself.