I just completed testing the Panasonic 3100 with a protection circuit . Length = 69.1mm Dia = 18.2mm
Lets check out the performance in 4 of my flashlights :
Flashlight | Battery Sanyo | Battery Panasonic |
SST50 | 2.5A | 2.1A |
MF XM-L | 4.7A | 3.8A |
SF XM-L | 1.85A | 1.8A |
MF XM-L | 4.7A | 4.4A |
Now when doing the discharge test for capacity , there was an interesting turn of events : Lets check out the graph I made .
@ 1A discharge , I got about 2500mAh capacity to 3v , and a further 350mAh when discharged to 2.5v
@ 2A discharge , I got about 1857mAh capacity to 3v , and a further 985mAh when discharged to 2.5v
@ 3A discharge , I got about 1326mAh capacity to 3v , and a further 1376mAh when discharged to 2.5v
Here you can see where in the voltage range the capacity or energy is coming from at various discharge rates .
As can be seen , as the discharge rate increases , more of the energy is pulled from bellow 3v . [ Due to voltage sag under load ]
Now this might be a very slight problem if you have a single 18650 flashlight , thats a bit of a hotrod , and you want to run it for as long as possible on high . [ Boost driver or well regulated ]
Now most of my lights , actually dont run when the battery gets bellow 3v , so ?
Now if your running a multi 18650 , I dont see a real problem depending on where the voltage on the driver may or may not turn the light off . [ Actually this may be more of an issue ] Sorry , I was tired and lots of homework to do , see link .
https://budgetlightforum.com/t/-/8223#comment-163066 Read here !