I’m going on a long bicycle tour and would like to take 2 18650 lights (Lumintop Prince and Nitecore HC30).
Is there a small portable charging device that I could use on my trip that I could charge and carry with me to charge up my batteries along the way?
Yes, there are several options for that. But there is one portable device clearly the most efficient, cheap and compact, it is called ‘spare batteries’
Thanks for all tips guys, managed to get it quite clean.
I have filed down the reflector even more and now the bottom is really thin, just as the gasket, i think this is all i can get out of it, very happy.
To clean it i have rinsed it using running tap water and blew it out using my new dust blower which recently arrived. After that i used 70% rubbing alcohol which i still had lying around (kids…) and used cotton wool which worked great.
Blew it out once again and it ended up really well!
I had a biophysics professor in college who was very fond of saying that any time infinity comes up in physics, it was natures way of telling you that you screwed up the math somewhere.
Difficult to answer because there’s more variables than you mention here (spring bypasses?, length/thickness of led wires?, low or high drain batteries?, old produce XP-G2 or new produce XP-G2?)
Personally, for every build again I look at the led test data, the battery test data, and at the components that I will be using, and then I do the calculation.
To be “protected”, you need the board on one end, usually the negative, and the sense-strip running to the positive end. To secure that strip at the positive end, you need a cap on top of the nekkid positive terminal, and usually that’s with a button-top cap.
Most are double-wrapped, with the sense-strip running between the 2 wraps, others like the panny-B just have Kapton tape covering the strip, which is then visible.
Most probably figure that if you’re sticking a cap on it already, you might as well make it a button-top so it’ll look like conventional cells and fit in holders, etc., without the need for nipples, springs, etc.