ti-force
Flashlight Enthusiast
I just went to the Kenworster.com runtime calculator and entered some data. I've often wondered this, but now I'm trying to figure it out. Do these numbers look right, or am I doing something wrong? I'm trying to figure out the calculated runtime for a Quark 123-2 R2, using 1x 17670 and 2x RCR123's.
For the 1x 17670 battery calculation, I entered in the following information:
Desired LED Current: 882mA
LED Forward Voltage: 3.4V
Battery Input Voltage: 3.7V
Battery Capacity: 1600mAh
Converter Efficiency: 90%
When I hit the calculate button, this is the data I get, which seems close enough to me:
Runtime: 1.78 hrs., which is 1 hr and 46 min.
Battery Current Draw: 901mA
Now for the 2x RCR123 runtime calculation. This is what doesn't seem quite right to me, but maybe it is. Here's the data entered into the calculator:
Desired LED Current: 888mA
LED Forward Voltage: 3.4V
Battery Input Voltage: 7.4
Battery Capacity: 750mAh
Converter Efficiency: 85%
Hit the calculate button and this is what I get:
Runtime: 3.13 hrs., which is 3 hrs. and 7 min.
Battery Current Draw: .480mA
I find 3 hours and 7 minutes of runtime very hard to believe. Am I messing up on the voltage or is this correct?
Thanks!
For the 1x 17670 battery calculation, I entered in the following information:
Desired LED Current: 882mA
LED Forward Voltage: 3.4V
Battery Input Voltage: 3.7V
Battery Capacity: 1600mAh
Converter Efficiency: 90%
When I hit the calculate button, this is the data I get, which seems close enough to me:
Runtime: 1.78 hrs., which is 1 hr and 46 min.
Battery Current Draw: 901mA
Now for the 2x RCR123 runtime calculation. This is what doesn't seem quite right to me, but maybe it is. Here's the data entered into the calculator:
Desired LED Current: 888mA
LED Forward Voltage: 3.4V
Battery Input Voltage: 7.4
Battery Capacity: 750mAh
Converter Efficiency: 85%
Hit the calculate button and this is what I get:
Runtime: 3.13 hrs., which is 3 hrs. and 7 min.
Battery Current Draw: .480mA
I find 3 hours and 7 minutes of runtime very hard to believe. Am I messing up on the voltage or is this correct?
Thanks!