At our indoor flying sessions, I keep diagnostic equipment in my battery box along with the chargers. Of course a digital volt meter is the prime tool. Mine has a couple of adapters. The one matching the batteries used on ultra micro models is most often used. I check the voltage on my batteries before and after every flight. If the voltage is below 3.7 volts I know I have been flying too long. If the time becomes short, it's time to replace them. I have the cells numbered and I really ought to keep a log. Li-Pos don't last forever. Remember, if you leave them fully charged they will lose half their capacity in a year.
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