Would this arrangement of Lithiums work?

[Mark_Larson]

So let's say i have a BB400/Q2 and a 3V lithium light. I want to increase runtime. Primary-level physics tells me that i would need to use batteries in parallel to increase current, and in series to increase voltage.

So at this point, i want to have two batteries in parallel for increased runtime. Am i correct so far?

I would love to do this in a Double-Barrel configuration to maximise the space available, and because length is often more noticeable than girth. However, i have a CNC-123 and two 123 battery tubes to work with.

So i've come up with this arrangement. Do you think its worth pursuing for an increased runtime?

The two batteries are in a series arrangement, but by virtue of an insulator and some wiring, are actually running in a parallel arrangement. I'm thinking of doing this with some sellotape and thin wire.

 

[Steelwolf]

This should work. In fact, I think someone has already done it. I'll see if I can find that thread...

I have found one where the poster used 6 button cells in 2 groups of 3. But I can't seem to find the one where the poster was using CR123 cells.

 

[whiskypapa3]

This is recent..

Parallel 123 Adapter

 

[Steelwolf]

Well done to WhiskeyPapa3! That was the exact thread I was looking for. /ubbthreads/images/graemlins/smile.gif

 

[Ginseng]

Yep,

That would be the exact configuration I used.

Wilkey

 

[AilSnail]

or you could use a down boy instead. I don't know which would give more runtime.

 

[Mark_Larson]

Would a Downboy really give more runtime than a parallel configuration?

 

[Steelwolf]

Got to do some calculations. Average efficiency of a BB400 vs DownBoy. Cut off voltage of both. Approximate mAh available from either configuration of cells. Peak current draw with BB400 vs DownBoy (to derate the available power).