User Manual

6
OPERATING NOTES
(a) Temperature
The ESR of any LiPo is dependent on temperature; the lower the
temperature, the higher will be the ESR. When comparing two
packs therefore it is essential that you do so at the same temperature.
Leave the two packs together for an hour or two to ensure this.
To demonstrate this, take a cell reading of cell 1 on a pack. Hold the
palm of your hand against the flat side of cell 1 for only 15 seconds
and take another reading. You will see that the ESR has fallen
slightly.
The ESR of lipo packs can vary by 30 to 90% for a temperature
change of 10⁰ to 30⁰C (50⁰ to 85⁰F).
(b) Winter Flying
The above demonstrates why it is important to warm your LiPos
before use in cold conditions. If you launch with cold LiPos the
voltage and power level is much lower, often to the point where the
ESC will shut down on undervoltage. The current through the LiPo
will heat it up (and damage it!), reduce the ESR and the power will
gradually rise. This is why so many LiPos fail in cold weather.
Therefore pre-warm your LiPos in winter.
(c) Voltage Readings
In Voltage mode the meter will read the pack or cell voltage,
dependant on mode. It is not intended as a precision voltmeter as the
resolution is limited, but it is accurate and consistent enough for
general use and cell voltage comparison purposes.