Brill PowerAccu 24 Manual Del Usuario página 11

charged accumulator will be
almost completely discharged
after a storage period of
6 months (winter).
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Complete Discharge
To prevent a complete dis-
charge, we always recommend
that the battery should be dis-
connected from the equipment
if it is going to be out of use
for a relatively long time. If a
complete discharge of the accu-
mulator pack takes place, it
can happen that the weakest
cell of the 20 cells drops below
0.8 Volt and the polarity of
the cell reverses, which leads to
the failure of the cell concerned.
Memory Effect
Memory effect refers to the
phenomenon where a nickel-
cadmium cell becomes unusable
if handled incorrectly. From
a technical point of view, the
energy of the cell is reduced
by overcharging and partial dis-
charging followed by recharg-
ing. This produces chemical
compounds on the electrodes
which now prevent the accumu-
lator discharging normally.
This becomes noticeable in that
the accumulator provides less
discharging voltage and any
piece of equipment connected
to it switches off earlier than
necessary. This phenomenon is
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temporary and can be rectified
by discharging fully to the final
discharged voltage (approx.
1 Volt per cell) and by a few
complete cycles (charged and
discharged approx. 5 x).
If possible, always run the
accumulator until the equipment
can no longer be used because
it has insufficient power.
Storage
The Brill PowerAccu should
be stored in a dry place in tem-
peratures which do not exceed
30 °C. The accumulator can
be stored either in a charged
or a discharged condition.
After being stored for a relati-
vely long time, the accumula-
tor should be run for approx.
5 cycles (charged and dis-
charged 5 x) to achieve full per-
formance by the cells again.
Structure of the Accumulator
Nickel-cadmium cell (NiCd) :
The active components of a
nickel-cadmium accumulator,
when charged, consist of nickel
hydroxide (NiOOH) in the pos-
itive electrode and cadmium
(Cd) in the negative electrode.
Potash lye (potassium hydrox-
ide) is normally used for the
electrolyte.
Nickel-cadmium cells have a
long life – up to 2000 cycles
depending on application and
charger.
Charger
The charger, which forms a part
of the accumulator pack, is pro-
vided with an electronic system
which only permits the output
voltage of 28.6 Volt if a resistor
connected in series with a volt-
meter and ammeter is used for
measurement.
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