Cell Care; Voltage Indicator, Pro Version - PowerBox Systems PowerPak 2.5X2 ECO Bedienungsanleitung

3. CELL CARE

The useful life of PowerPaks can be extended significantly by handling them
correctly; this also enhances the safety of the cells.
The self-discharge circuit built into earlier PRO versions is to be discontinued
as of Winter 2018; the new version can be identified by a yellow dot on the
underside. This feature required a micro-controller whose idle current in many
cases caused cells to be deep-discharged if the battery was stored for a long
period. The circuit also proved to be incompatible with the charging electro-
nics of turbine generators.
The following applies to the PRO and ECO versions:
The self-discharge rate of our PowerPaks is very low, which means that, after
a flying session, it is best to store the model with the batteries part-dischar-
ged, and then recharge them before the next outing.
In both versions the useful life of the cells can be extended by discharging the
cells using the BattLife Guard to storage voltage (approx. 7.6 to 7.8 V) before
any protracted period of storage.
Note: A frequently asked question is this: "how can I tell whether the bat-
tery is still in good condition?"
With Lithium cells this is very easy to determine: give the pack a full char-
ge, then discharge it to 3.0 V per cell using a suitable LiIon / LiPo battery
charger. If the measured capacity is greater than 80% of its nominal capa-
city, the PowerPak is still in usable condition. If the discharged capacity
falls below this level, then please refer to Point 5.

4. VOLTAGE INDICATOR, PRO VERSION

In addition to the integral charge and the balancers, the PRO version features
an integral voltage indicator. When the PowerPak PRO is in the charged state,
the internal and external LEDs are switched off. The red LED lights up as soon
as the battery capacity falls to 30%.
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