Runtime over Lumen - Parallel CR123

[Bismarck]

Hi guys,
I've a doubt that's rattling about my head.
I've two Surefire heads, a KM1-D (currently fitting my V1 Vampire) and a spare KM1-E, both designed to run on a single CR123 (250 peak lumen and approx. 2.5 hours runtime).
I'm thinking to buy a longer body (like the M600) to accommodate two CR123 and wire them in parallel with flat contacts to double the fuel.
Do you think is this possible?
May I risk to damage the head?

Many thanks in advance!

Marco

 

[Duster1671]

A possible issue that comes to mind would be the voltage sag of a single CR123 vs two in parallel. The two in parallel will each supply half the current, and therefore the voltage under load will be higher, no?

Maybe the head can accept a high enough input voltage that it's not an issue, but something to consider.

 

[vicv]

I imagine the light can handle the small voltage overhead since different cells will sag differently

 

[Lynx_Arc]

I see nothing wrong with this idea other than if not properly implemented could lead to shorting. One other issue is if there is high enough current the extended leads to accommodate the second battery could be an issue if the resistance is substantial and the leads introduced too much resistance there could be heating up of the connections/wires.
I'm thinking unless it is your favorite light a cheaper solution than spending money on a tube and designing it for parallel cell use would be just to invest in a good 18650 light instead that would give you a lot more extra runtime over double 123 cells.

 

[fivemega]

Normally, LED Surefire can take little over volt of single 16650


.