I went to the site and checked the mod kit, it shows that it comes with batteries and a charger, unless I missed something where the kit comes without?
I also checked the rs website and I'm not able to bring up any such batteries, unless he used a 're-chargeable' battery, nothing in a search on the site for enercell shows up for 3.7v, 1600mah, I may have missed something, but did quite a few different searches, by brand, size, etc.
It's never a good day for us to see something like this happen to anyone. I hope that anyone who is using anything but what is recommended for their apv is taking a serious second look at what could happen.