On Fri, 9 Feb 2018 13:35:24 -0800, sms
wrote:

On the light with the new 5200mAH battery back, one test gave 157
minutes, one 162 minutes.

On the light with the old 5600mAH battery pack, one test gave 193
minutes, one test gave 216 minutes.

It would seem that your new Amazon batteries are somewhat over-rated
and that your old battery pack still has quite a bit of life left.

Let's see what the numbers show:

1400 lumens, at an optimistic 150 lumens/watt equals 9.3 watts.
At a nominal 3.7V battery voltage, current drain:
9.3w / 3.7v = 2.5A

The rated 5600 ma-hr is measured at 0.2C. At roughly 1 C the rating
drops by approximately 15% to 4800 ma-hr.
4800mA-hr / 2500mA = 1.9 hrs = 115 minutes

You're doing much better than I would predict.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558