Hi guys. I bought a Mecarmy PT16 a year or so ago and since I've owned it I have just used the crappy 16340 battery that came with it. So, finally, I decided I was going to get some decent batteries for it and I ran across a post saying the 18350 will fit in some lights that use the 16340. So, I searched online and I saw in the ad for the titanium PT16 it says it will also accept the 18350 (for longer run times) but it never mentions that option in the ad for the regular PT16. I'm assuming it will be fine, but I wanted to ask you pros first. Also, if it is ok to run an 18350 which do you guys prefer? I did a search here and it looks like one favorite is the Vapcell 1100 mah. Thanks for your time, I really appreciate it.