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LiPoly Battery Information

Voltages:

Base: 3.7v per cell
Max: 4.2v per cell
Discharge/Minimum: 3.3v per cell
Damage at: 3.0 volt possible.
Note: Charge to 4.1v per cell can extend battery life.

80% Rule:

Approximately 3.5 volt per cell will be about 80% discharged. This can also read back up to 3.7 volts “resting” after 5 to 10 minutes.

Milliamps – leave 20% in pack/ 80% used or “put back” during charge.

Battery Care…

Charging = 1C
Condition the battery, charge = 0.5C
Balanced Cells = 0.03v max difference for a Charged Pack. No difference or 0.01v is best. Note: Partially discharged pack can have larger differences between cells (0.1v)
Balanced cell voltage measured in fresh charged pack!!
Do not Discharge to balance, it may over-discharge and damage cells.
Storage = 3.85v (1/2 between 3.7v-4.0v resting)
Note: A drop of 0.1v from a cell in 1 day may indicate a bad cell/pack.

C Rating…

“Capacity” in milliamps times “C” rating = discharge capacity.

Example: 2200ma/1000 mA/A X 15 “C” = 33 Amps

4S, 14.8v, 2200 mAh, 15C battery…

Max Voltage: 16.8 volts
Minimum Voltage: 13.2 volts

Target 80%
= 13.44 voltage reading
= 1760 milliamps “put back”; 440 milliamps discharge remaining.
Note: 2200 mAh discharged at 33 amps = 4 minutes.
However, @ 80% => 1760 mA at 33 amps = 3 minutes 15 seconds.
Also, 80% flown at 80% throttle => 1760 mA at 26.4 amps = 4 minutes.

Therefore: 4 minute flight good starting point!!