DD MC-E with 2x18650?
- Thread starter bbgobie
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phantom23
Flashlight Enthusiast
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- Nov 3, 2007
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It may work. I'd suggest some small resistors- Vf of dies is smaller than V of fresh Li-Ions.
TigerhawkT3
Flashlight Enthusiast
Might want to try LiFePO4 instead of LiCo - 3.7V fresh, 3.2V nominal.
phantom23
Flashlight Enthusiast
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- Nov 3, 2007
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- 2,044
They won't hold 3,7V for long timeand 3,2V won't give enough current.
gillestugan
Enlightened
No, the AMC7135 is acting like a self adjusting resistor to keep the current fixed. But you will get very food efficiency when battery voltage is close to the Vf as voltage drop. When battery voltage is lower than Vf it will act like direct drive except you will lose 0.2V.
It will work but you need to make sure you get the correct voltage bin and I don't think it's easy to find voltage binned Cree MC-E. You maybe better off using SSC P7 for direct drive as J voltage bin will work well and is easy to find.
I think the best regulated solution would be to use the Maxflex driver to drive the MC-E's 4 dice in series with the 2 x 18650 also in series.
I think the best regulated solution would be to use the Maxflex driver to drive the MC-E's 4 dice in series with the 2 x 18650 also in series.
