10 volts in SF M6 batt pack?
- Thread starter nuggett
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wquiles
Flashaholic
The M6 has two parallel stacks, each one with 3 CR123 cells in series, so the nominal voltage is around 9 volts or so (no load). The loaded voltage with the MN21 is about 6.7-6.8 volts or so, and about 7.2 volts for the MN20.
Will
Will
mdocod
Flashaholic
A set of 3 FRESH lithium primaries, could net close to around 10V with no load..
I am suprised to hear that it flashed so soon though... maybe those pentagon cells are different than other lithium primaries?
I am suprised to hear that it flashed so soon though... maybe those pentagon cells are different than other lithium primaries?
andrewwynn
Flashlight Enthusiast
don't know the problem.. do know the the solution.
dunno how the link broke.. http://http://hdm6.rouse.com in-case still broken
-awr
dunno how the link broke.. http://http://hdm6.rouse.com in-case still broken
-awr
Last edited:
dizzy
Flashlight Enthusiast
I can't get the solution link to work. I think I know what it is though!
I am amazed that the MN21 will pull the voltage down that much. I have a lot to learn about this stuff. A little different than my usual 120v wiring!
Each cell on my cheap analog meter looked normal, I will need to get my Fluke digital to read the smaller increments.
Each cell on my cheap analog meter looked normal, I will need to get my Fluke digital to read the smaller increments.
andrewwynn
Flashlight Enthusiast
CR123s are really meant for low-current devices.. definitely less than an amp. In an M6.. about 22W are consumed heating the batteries.. and about 33w gets to the lamp.. 61% efficiency.. ouch.
apparently.. regulation wouldn't hurt with primary cells either.
-awr
apparently.. regulation wouldn't hurt with primary cells either.
-awr
wquiles
Flashaholic
It never ceases to amaze me how wastefull running the M6 is on primaries. Clearly the cost of replacement batteries was very low in the priority list, which is OK given the intended use/audience. For us flashoholics, it is a fantastic host with a terrible power sourceandrewwynn said:
Will
I was wondering about all that heat coming from the power pack when running it.
Once , I opened it and air cooled the batts, I was so concerned about the heat.
But it has spoiled me, I am not so awe struck by my G2 with P61 anymore!
Seems that Optics HQ has MN20 bulbs, so it ans a MN21 are on the way.
Once , I opened it and air cooled the batts, I was so concerned about the heat.
But it has spoiled me, I am not so awe struck by my G2 with P61 anymore!
Seems that Optics HQ has MN20 bulbs, so it ans a MN21 are on the way.
andrewwynn
Flashlight Enthusiast
I measured over 180F on the battery pack after 11 minutes.. 22W of heat is impressive in such a small space.
-awr
-awr
dizzy
Flashlight Enthusiast
nuggett said:
Their latest stock list does not show any MN20's as far as i can tell. Are you sure they have them because if they do I will definetly order one. I still have the coupon from surefire for a free MN20 or MN21 too so I would just call them and get another MN21 for a spare.
well,the order went through, at least until a human sees that there are no bulbs on the shelf! And whats this about a 35watt osram bulb on the HDM6 thread? sounds interesting. Emailed Surefire with the coupon, so another bulb on its way. backup for the backup.
