Help-How to Convert Light From x3 To x1 Battery ?

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202bigmike
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Help-How to Convert Light From x3 To x1 Battery ?

I have a Defiant flashlight—Listed as 850 Lumens , it has (x3) LED’s , uses “C” cell Alkaline batteries (x3) that

was sold by Home Depot. I want to convert flashlight to use (x1) 18650 battery. Other then using a battery extender,

what else should be done to the light , in order to accomplish the change to the use of one lithium battery for it ?

Edited by: 202bigmike on 07/10/2018 - 23:53
toddcshoe
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Sounds like a battery extender is all you really need. I have seen guys use short pieces of copper pipe with caps on the ends to finish off the connections and using some tape or shrink wrap to keep the copper tube from hitting the flashlight tube. Then maybe using some plastic spacers on the 18650 to make up for the larger diameter of the C cell.

Or maybe run it with 3 Eneloops with C sized spacers they use. That would work I think.

202bigmike
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RollTide , Thanks for your reply. I was thinking , will I maybe have to change a driver on the light ?

toddcshoe
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I don’t think you would have to change the driver as long as you are happy with it. The voltage of 3 C cells in series vs 1 18650 is so close that it won’t matter to the driver I wouldn’t think. The driver doesn’t know the difference between LiIon and Alkaline as long as it sees it’s DC voltage tolerance.

202bigmike
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I asked the driver question because I remember somewhere

and somehow something was said or written about changing

the drivers on this type of battery swap. If this function could be

named a battery swap.

mmalive
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Read the thread about this flashlight. I did MODs to accept 18650, 26650. CR123A. I only use “ C” alkaleaks for emergency.

toddcshoe
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Doh! Forgot about that thread. Here it is I believe. http://budgetlightforum.com/node/52834

202bigmike
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I replied to that thread back in 2017—Posts #4 & #7 and just flat-out forgot about it because of nothing after #8.

As you can see , there were NO other posts/answers on it from 2/19/2017 until 11/17/2017.—-Nine months !!

It has grown after that.

202bigmike
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Question [quote=mmalive]Read the thread about this flashlight. I did MODs to accept 18650, 26650. CR123A. I only use “ C” alkaleaks for emergency.[/quote

What & How did you do it Question

Firelight2
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Any light that will run on 3 alkalines should run just fine on 1 lithium ion cell with no change in driver. All that’s necessary is using a spacer so that the battery or batteries can physically make contact with the ends of the battery tube.

202bigmike
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Firelight2 wrote:
Any light that will run on 3 alkalines should run just fine on 1 lithium ion cell with no change in driver. All that’s necessary is using a spacer so that the battery or batteries can physically make contact with the ends of the battery tube.

Do you have recommendations for any types of spacers ?