Storage - FES GEN2 14S Manual

FES BATTERY PACK GEN2 14S, Version 1.23

8. Storage

When you stop flying for longer time, for instance during winter time, it is
mandatory to discharge FES battery packs to 50% of charge. This is to middle voltage,
3,7V per cell (this is about 52V per pack, or 104V indicated on FCU instrument, when motor
is stopped).
- You can discharge them during last flight at the end of season, or
- you can use FES discharging assistant device (you can find more info about this
optional equipment on our FES website)
The most important environmental factor for slowing aging is the temperature at
which battery packs are stored. Store battery packs between 10°C to 20°C, at normal
humidity conditions. Do not store batteries at high temperatures or below freezing
temperatures or in very humid environment (like in poor all metal glider trailer).
Note: Always try to avoid having packs exposed to high temperature, as high
temperature is decreasing life of cells significantly.
FES 14S discharging assistant
Page 24 of 26
September 2019