I wa not real happy with run time with CygoLite-Hotshot-Pro-150-Lumens-LED.
(Even on blink mode)

It has a built in 800 mah LiIon battery.

Made an external battery pack using 18650s with a 5000 mah capacity.

https://www.dropbox.com/s/ux5xmncsyl...ight.jpeg?dl=0

The UltraFire batts are overrated and I have much better ones.

But I want to use them up.

Next project is the make my lights harder to steal.
Any ideas would be appreciated.

Andy