Just purchased this light (in the title) and am thinking about using one of these (Olight RCR123A Rechargeable Lithium-Ion Battery (3.7V, 650mAh).
Thoughts? Should it be ok or suggest not using it?
Congrats on your new Copper CR123 Maratac!
Olight makes some great batteries, but the one you listed is not one of them
this is the Olight Battery I use and recommend, for my Olight S Mini and Olight S1 Mini, but NOT in the Maratac CR123
Officially that light only supports CR123s (3V) and that is the safe answer. Higher voltage runs the possibility of frying the driver and rendering the flashlight dead.
This light is advertised as 450 lumen output, which would require at least 1A off the cell to achieve.
On my homebrew meter the High is actually 238 lumens
CountyComm has very optimistic Lumens claims, and though my meter is not very sophisticated, I believe it is in the ballpark
see this review
https://www.candlepowerforums.com/vb/showthread.php?449554-Copper-Maratac-CR123-first-impressions
regarding LiIon, the correct answer is No, that is not a supported chemistry, and though some people get away with it, I suggest sticking to CR123 Primaries...
from the last post in the review thread:
I used one in mine for a couple months with no issues. I never ran it on high for very long though. To be honest, I don't recommend it. Not enough of a difference on high to be worth the risk. Ended up switching back to a cr123.
If you decide to gamble, I strongly caution you NOT to use UnProtected 16340, (I do like the Olight mini USB rechargeable cells, because they ARE protected). The Maratac has no built in OverDischarge protection. One of the dangers of using LiIon, is that IF they get OverDischarged, they heat up during recharging, and can Vent with Fire. In all cases, do NOT leave LiIon connected to a charger unless you are present to detect OverHeating.
since you seem a bit new to the entire LiIon Chemistry Subject, maybe
start by reading more about them here and or spend some time
googling LiIon Safety
at minimum, you should invest in a MultiMeter so you can read battery voltage and act accordingly
I do not know if the Protected Olight mini USB rechargeable 16340 will fit in a Maratac CR123, they are slightly longer than CR123, and some lights wont close all the way.. thereby failing to make contact between the body and the pill.. the result is NoLight, or worse, crushing the Pill or the battery.
I strongly suggest you just say NO to LiIon in your Copper CR123 Maratac.
bottom line, unless you are an experienced LiIon user, the Maratac CR123 Light is not the right light to learn on.. imnsho