I'm looking at this Ultrafire light( XM-L T6) andiit comes with 2 x 18650 @ 2400 mAh batteries. Has anyone used it with 3600 and 5000 mAh batteries?
I don't think that these batteries with higher mAh have different voltages, but are they safe to use in this light? I need longer run time so the larger capacity battereis are much better for me.
You aren't going to find any 5000mAh 18650 cells. You would be better off with getting some Trustfire Flames or similar. An Ah rating doesn't affect voltage or current; that's just a rating for capacity. It tells how long the cell can provide the current in ideal conditions. And is quite often inflated to make the cells sound better than they really are.
<edit>
If you absolutely need runtime, you can get a high-voltage XM-L drop-in from Solarforce-sales:
http://www.solarforce-sales.com/product.php?sname=&s=40&t=RB
Use this in a 2x 18650 host like this one...
http://www.manafont.com/product_info.php/ultrafire-wf502d-flashlight-tube-no-led-emitter-p-4295
...with a pair of 3000mAh Trustfire cells (others have tested these to be about 2200-2500mAh)...
... to get close to your total of 5000mAh capacity.
I've never purchased from SolarForce sales, but they are highly reviewed by several of the users on this site. I purchased the host I referenced above and the quality of the sample I received was poor. The pocket-clip screws were stripped out and there were several scratches on the body. Keep that in mind before you order...
if they're blue ultrafire batteries, skip it, buy just the light and some decent batteries (TF flames or better)
I've got a few of those from buying them bundled and they're junk - especially trying to drive an xm-l
Isn't it also generally true that within each cell size:
A) the higher amp-hour capacity the more "saggy" the cell is under high current draw applications.
and
B) the higher the amp-hour capacity the more quickly the cell will self discharge when not used.
Curious... thanks!!
Welcome, Gnappi...
You've heard some good advice here. Better take it (I found out the hard way)--especially with regard to those blue pieces o' cr@p! :-)