I have a flashlight that I bought in error from Dealextreme 2 years or so ago. I meant to order an AA flashlight, but got the wrong option, and ended up with something that needed different batteries. Since it was only $15 or $20, I decided it wasn't worth shipping it back, and just ordered what I really wanted (the mistake was definitely mine, btw). At the time, i thought I'd ordered a light for 14500 batteries, and since I didn't want to buy a new charger, I never ordered any. However, this week, I ordered some 14500s for another purpose, and discovered they don't fit. They are too narrow, and whilst one is too short, two is too long (same story for AAs). 186500 (which I have for a P7 I bought later) look about the right length, but are too fat. It says on the side of the light "3.6v x 2". What do you think I need?