I am wanting to drive a Q5 from 2x18650 batteries, not really wanting to buy AW's at this time. Will be either ultrafire, LG, or perhaps tenergy. I have been looking at cells and circuits for pack building from several places, and I notice that all the protected cells with internal PCB say NOT to pack build with these.
Here is a link to just one example:
http://www.batteryjunction.com/li18322mahre.html
I already own a 2x18650 light that I am running ultrafires in, to the best of my knowledge with no adverse effects.
To safely do this will I need a driver board that has a low voltage protection built in? Or, will I have to build a pack with a protection circuit for 2 cells, like one of these?
http://www.batteryspace.com/index.asp?PageAction=PRODSEARCH&txtSearch=protection+circuit
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2771
So, I can only guess with the built in PCB's they are claiming because they are set for 2.5 volts, they would be useless in a series circuit as the last (or first) battery in the circuit is actually passing voltage from both batteries, therefore the low voltage kick in would be useless?
On, and on a related note, that would not be the case for 2x18650 parallel?
I have looked at some of the ROP LE's and never seen this mentioned before.
It would SEEM as long as the 2 batteries are somewhat balanced before running them it would never be a problem, but perhaps it would be because the internal resistance of each cell varies?
Here is a link to just one example:
http://www.batteryjunction.com/li18322mahre.html
I already own a 2x18650 light that I am running ultrafires in, to the best of my knowledge with no adverse effects.
To safely do this will I need a driver board that has a low voltage protection built in? Or, will I have to build a pack with a protection circuit for 2 cells, like one of these?
http://www.batteryspace.com/index.asp?PageAction=PRODSEARCH&txtSearch=protection+circuit
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2771
So, I can only guess with the built in PCB's they are claiming because they are set for 2.5 volts, they would be useless in a series circuit as the last (or first) battery in the circuit is actually passing voltage from both batteries, therefore the low voltage kick in would be useless?
On, and on a related note, that would not be the case for 2x18650 parallel?
I have looked at some of the ROP LE's and never seen this mentioned before.
It would SEEM as long as the 2 batteries are somewhat balanced before running them it would never be a problem, but perhaps it would be because the internal resistance of each cell varies?