Remaining Capacities of Lion Batteries

Sorry, but I do not have the knowledge to understand the tables re the 1A and 3A values.
I have no idea what my lights draw so am not sure how much remaining capacity my batteries have.

For example I have an Ultrafire 2100 light that I am running in the LOW mode to see how long it will run and be useful. After 8 hours with no detectible reduction in light the Trustfire Flame 3000mah battery is at 3.82V. I assume that it has about 50-55% remaining. Is this about right?
ADDED: Battery charge percent

Sorry for not providing the link.:frowning:
Thanks,
Jerry

1A and 3A refer to amps, watts (power) is volts x amps, li-ion put out 3.6-4.2V depending on charge level, and the higher the amps drawn in a flashlight the higher the brightness.
3.8V would suggest 40-50% charge remaining

Thanks, Bort. I appreciate the reply.
Jerry

This is a chart I found in my files. I don’t know where I got it from.

Here is open circuit “Resting” Voltage for Li-ion:
4.3 volts = OVER CHARGED!!! (WARNING: Defective charger, discontinue it’s use!)
4.2 volts 100%
4.1 about 90%
4.0 about 80% (I usually top them up back around here)
3.9 about 60%
3.8 about 40%
3.7 about 20%
3.6 empty for practical purposes
<3.5 = over-discharged
Continually discharging below 3.7v down to 2.7v PTC cutoff will damage cell and reduce life.
“0” volts means the Protection Circuit has been tripped

Thanks, Ouchyfoot. That is helpful.
Regards,
Jerry