Title says it all... I can fit an IMR 26650 in after I've stripped off the wrap. Glued the insulating ring back on the + end so no shorting risk. Works fine with no hack-job sanding or filing.
However, to get max performance I need to bump it up to 4.8V. Any ideas?
Please don't mention boring or machining-no access or money to do so. Same with unaffordable/unavailable/vaporware tailcaps. Some were promised to me and never materialized. This must be a simple, no-machining process.
I do know about the small sub-C's that Battery Junction sells-I have four in a 2D that I did-but would require unobtainium parts for a 2C.
Tough one! Well, there are 1/2 C-NiCd-cells out there, so you could theoretically put four of them in your 2C Mag... but they only have 650 mAh, so that is probably not enough for your needs. Seem to be quite rare, too. Could only find these here:
Custom C tailcaps of any kind. Either too much money, or wound up vaporware/promiseware. Had some promised by someone for months and never materialized nor do I expect them to by now. And I'm not gonna spend more on CPF for one that costs more than the whole light, batteries, everything.
About the closest would be a LiFePO4 26650 and a 4/5 Sub C NiMH and that's not ideal. You'd want ones with capacities that were very close (if possible) and watch carefully how much you discharge it.
EDIT: On second thought, you could use a 26650 and a 4/3A NiMH (18650 size) and de-annodize the inside of tailcap and run springless. You could even try your LiMn 26650 if you aren't afraid of a little extra voltage.
C cells are nominally 26.2x50mm so you want 100mm length for four NiMH - which will be nearer 6V fully charged, might want them to rest a bit before use.
Mag springs are usually silly strong and long - if you clean out the tailcap you probably can get another 15-20mm to play with - lets say we have 120mm possibly so 4 cells of 30mm or less.
Sub-Cs are normally 22.2 by 42.9mm so you'll only get there of them in. Two B cells would fit - but that wouldn't be adequate voltage. 2/3A cells should do the trick but they are only 16.5mm in diameter. You'll easily get four of them in a 2C though as they are only 26.5mm long. These should be easily available.
There is a 2/3 sub-C which is 26.5mm long and 22.8mm in diameter with a capacity of 1500mAh. The place I use is in the UK so wouldn't be a lot of use to you.