Mountain Electronics has NCR18650BD protected cells that have low internal resistance and a protection circuit that trips around 7amps. Are there any other known options? Has anyone strapped a protection circuit on a Samsung 25R? I use 25R’s in most of my high-drain lights, but I’m not comfortable using unprotected cells in series (for 6v emitters), hence my question.
There is very little point to a super high drain cell like the 25R with a protection circuit because the protection circuits add resistance, no matter what. If you set the amp trip limit super high then you are basically just getting low voltage protection.
Just an FYI, most of the protected Evva cells will do over 7A without tripping, but they told me that they should only be run at 7A continuous (I imagine that the circuit will overheat and fail if pushed too hard for long). Most of them have three MOSFETs compared to the one or two that most other protected cells have.
I was wondering more from a cost standpoint. 7amps is plenty, but bare Panasonics are expensive. If they started with a 25R, the whole thing should end up cheaper, no?
Cost would make more sense. The issue then becomes that despite any markings or warnings to the contrary, people will buy the protected 25R then complain when they can't draw 20A-30A from them.
Your certainly right to want only protected cells in series. No matter how careful a person thinks they are, we are all still human.