I just signed up for ECF but have been vaping for about 2 years and using mech mods for almost 3 months now. I wanted to test my batteries mAh on my multimeter just as an experiment. I used 2 settings on my multimeter to try and calculate this. The DCV setting for testing the before and after volts. The mA setting to drain the battery and also a stopwatch to record the time it took to drain x amount of volts. I didn't fully drain the battery because I wanted to see if it would work this way. I also used a cheap battery which I do not use. Xtar 18650 30A 2100mAh 3.6V. Supposed to be a VTC4 cell but I doubt that due to the rapid rate it discharged at. So I started the test at 4.19V on the DCV setting. Then I switched to the mA setting, moved the red positive pin to the 300mA hole on the multimeter, put the multimeter pins on the positive and negative of the battery and started my stopwatch. After 6 mins I stopped, recorded the volts left and multiplied the difference by 10 to get the volts dropped after 1 hour. (Volts left 4.13V, difference of 0.06V, multiplied by 10 0.60V, 3.59V after 1 hour.) I know this is probably not accurate because I only measured over a 6 minute timeframe but just wanted to test it. This would mean it would take about 2 hours to get down to 2.50V and about 7 hours to get to 0V (I know you do not do this). I took the 7 hours to get to 0V and multiplied by 300 (mAh setting on multimeter) to get 2100 mAh rated by the battery. I just want to know if I had done this right. If not, what did I do wrong?