Runtime of Surefire C2 + M61WL + AW 17670

RtOaNn said:

Hi guys,I ordered a C2 recently and after looking at several P90 LED drop-ins, I have decided on the M61WL.

I think I wouldn't wanna bore out my C2 to fit a 18650 so the other rechargeable option is the 17670.

Looking at the specs sheet of the M61WL, anything below 3.4V would direct drive it. So with a 17670, how much regulated runtime do I get before it goes into direct drive?

Anybody using the same setup?

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shane45_1911 said:

My C2 with M61W and 17670 gives me just over 1.5 hrs of regulated light.
My C2 with M61WLL and 17670 gives me just under 7.5 hrs of regulated light.
Your C2 with M61WL (I don't have this one. Don't tell Gene!) and 17670 will give you something in between, my guess being about 3.5 hrs of regulation.

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precisionworks said:

you are correct and I am wrong

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shane45_1911 said:

My C2 with M61W and 17670 gives me just over 1.5 hrs of regulated light.
My C2 with M61WLL and 17670 gives me just under 7.5 hrs of regulated light.
Your C2 with M61WL (I don't have this one. Don't tell Gene!) and 17670 will give you something in between, my guess being about 3.5 hrs of regulation.

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precisionworks said:

:shrug:

gene malkoff could give a more exact answer, but 2 + hours should be close.

The 17670 can supply 1200 m A h, and the m 61 draws 450 m A. The math would indicate almost 3 hours but there are efficiency losses that must be considered.

FWIW, the 18650 has almost 2.5 times the capacity of the 17670 (2900-3000 mA).

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