The absolute max allowed voltage of a rechargeable lithium battery cell is 4.2V.
My mistake I must been having a bad day when I measured 4.3v, and I've based
all of my calcs on it.. duh!!
Sorry I'll start again.. measured output from the battery fully charged is 3.82v
Stats for the battery are on the attached .pdf
It's only a small helmet camera, a mate asked me to look at as the battery runs down very quick around 15 minutes, it should last over an hour. I didn't imagine it had much consumption at all.
It's similar to this.. I can't find the actual unit..
**broken link removed**
The LM317 got very hot (hot enough to burn you), and I wanted to avoid a heatsink, by blowing on it I could raise the output voltage LOL!! That may have something to do with me trying to supply the camera with 4.3v, I'll try it again with 3.8v.
(over to the desk..... )
Which I just did, at 3.8v and it works without overheating, it's barely warm to the touch.
Thanks guys.. looks like you've hit the nail on the head in one easy query.. well done.
PS
I'l be back mooohaahhaaa