Re chargeable batteries and flashlight fitment.

After many questions about how many rechargeable batteries can you put into a light?
It is not on how many re chargeable batteries but on how much voltage.
An example is the Olight M30, I can use either 3 or 4 CR123 batteries. Most people ask if you can use 4 re chargeable batteries in the M30? The answer is only if the Max. voltage is below 12 Volts DC.
As most all of the re chargeable CR123 batteries are 3.7 volts each, they will not work. 3.7 x 4= 14.8 volts or 2.8 volts too many.
This will overload the circuits and cause them to heat up or just plain burn up.
You can use (2) 18650 4.7 volt re chargeable batteries in the longer configuration with out any issues.
Also there are questions of what size batteries will fit into each type of light?
The M Series Use the 18650 or the CR123 batteries. Tbe magazine is a little larger to accomodate the thicker 18650 batteries.
The T series will only fit the CR123 batteries in the magazine.
There several other more exotic size batteries that I will call the exception to this rule but they are harder to come by and usually more costly.
Thank you
David
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