reading old school cookbook mag18c Is this safe?

[VegasF6]

I have a mag 4C that I am trying to figure out what to do with, and I came across this post:
http://www.candlepowerforums.com/vb/showthread.php?t=72194

This is the part that concerns me:
A. Mag18C
Body: Mag 4C
Bulb: Welch Allyn WA01318 (or WA01331) 9.6V, 1.93A, 534 spec bulb-lumens
Lens: UCL (Borofloat for extreme use)
Reflector: Fivemega OP Cammed drop-in, modified Carley RF1940 or Otokoyama PMR (out of production)
Batteries: 4.5 x CR123 (4 x CR123 + 1 x AA lithium)
Battery holder: PVC tube with tape ring spacers, foam or rubber hose
Supplemental: For PR-base potted WA01318, none needed. To use bare bi-pin bulb, install the MC BP mod.
Notes: This is an overdrive mod and suitable for backup storage use. It makes over 900 bulb lumens and nearly 600 out the front

So, they are suggesting 4 cr123 (primaries? 3 volt, what 800 mah?)
And one 1xAA lithium (again, primary? 1.2V like an energizer E2?) (900mah)


So, besides the different capacities(nominal) what about the different voltages as well? Unless they are talking about a 14500, but I doubt it as I think that voltage would be way to high.

I was under the limited understanding that when using multiple lithiums, ideally they should be protected. And if not, in the case of using primaries the voltages must be matched. Is this not ALWAYS the case?

 

[lctorana]

Can I make a suggestion?

How about buying yourelf 6 x 4/5 SubC cells and a Pelican 3854H bulb and make yourself a RoP. No modifications, other than a substitute lens & reflector, would be required.

That should give you about 900 lumens, without risking the creation of a

 

[VegasF6]

That's a possibilty. I could disassemble my 2d 6 eneloop and make one. CBP's is out of stock though, and even if they had them, it doesn't appear that I would gain any run time for my 35$ battery investment.

Now the sub c's, that is a significant improvement, but I would need an extender.

Or how about 3 AW c-cells for 10.8V, and I could build a mag85 out of it.

The options are pretty much endless, huh?

Mainly though, I am still wanting to know if that battery combination is safe. Not so much because I am going to do it, just trying to learn.