Mmm, 35mm is pretty wide, there won't be many guns that can take them. To be fair, HobbyKing not only list the dimensions, they even let you search by maximum dimensions.
I managed to get some batteries from Hobbyking UK this week - but generally they are short on the stock front at the moment. The UK warehouse has been running a reduced capacity for a while now. Hopefully they sort things out soon.
TBH four were bought a few months ago. The new six are to replace knackered old ones I bought nearly 10 years ago now.
The joys of having three sons and a brother-in-law that want to play airsoft. I need to keep enough kit for them to all use. Great excuse to buy guns and upgrades though.