pnwoutdoors
Enlightened
Newbie Alert Profuse Thanks
In all of my reading and poking around the archives on CPF, I have yet to find a plain-language answer to something fairly basic and fundamental. It's almost as though each write-up or document I find presumes the reader already knows this stuff as basic, common knowledge.
For this question, let's consider the various P60-sized drop-in LED modules that NailBender is offering for sale.
For example, the various LED module combinations have voltage ranges including:
1V to 4.2V
2.8V to 6V
3.6V to 6V
3.6V to 8.4V
4V to 14V
Now, I have a flashlight host body+head+tail that supports P60 drop-ins (ie, SolarForce L2), and I would like to run the AW 18650-P (protected) Li-Ion cell.
My basic questions are:
Thank you for whatever clarification you might be able to provide.
In all of my reading and poking around the archives on CPF, I have yet to find a plain-language answer to something fairly basic and fundamental. It's almost as though each write-up or document I find presumes the reader already knows this stuff as basic, common knowledge.
For this question, let's consider the various P60-sized drop-in LED modules that NailBender is offering for sale.
For example, the various LED module combinations have voltage ranges including:
1V to 4.2V
2.8V to 6V
3.6V to 6V
3.6V to 8.4V
4V to 14V
Now, I have a flashlight host body+head+tail that supports P60 drop-ins (ie, SolarForce L2), and I would like to run the AW 18650-P (protected) Li-Ion cell.
My basic questions are:
- How do I know which battery configuration (ie, 1x18650 or 2x18650) would be suitable for a particular LED module, given the listed voltage range?
- With the 18650-P (protected) battery at 3.7V, doesn't this mean that an LED module with a voltage range of 3.6V-6V would be unsuitable, given there's only 0.1V of leeway in which to run the battery? According to the Introduction post written by mdocod back in 2007, Li-Ion cells peter out at 3.5V.
- If I want to run 2x18650, doesn't this mean I need a driver that goes above (2x3.7V) 7.4V, such as the 3.6V to 8.4V module, or the 4V to 14V module?
- The module showing 1V to 4.2V indicates use of a AA battery. But, 4.2V is above the 3.7V that a 1x18650 Li-Ion cell has. So, wouldn't an LED module with a voltage range of 1V to 4.2V support a 1x18650 battery? If not, why not?
- Is there anything else that drives the choice of batteries, here? What am I missing? (And, I'm assuming I'm missing something.)
Thank you for whatever clarification you might be able to provide.
