Battery Information; Why Must The Battery Be Charged - Husqvarna 967187001 Workshop Manual

14.4 Battery Information

A lead accumulator (popularly called "lead battery")
is the most common type of battery and the battery
type used in this machine. Batteries are heavy
and can store a large amount of energy. In order
to attain the voltage required in the machine, three
batteries have been couple in series.
The machine battery is 12V. If three batteries
are couple in series in the machine, the resulting
voltage will be 3 times 12 = 36V.
The cells comprise principally of a cathode
made of lead, an anode made of lead dioxide
and an electrolyte of sulfuric acid diluted with
water. A lead accumulator must be maintained
by topping up with water, as it slowly evaporates,
whereby contact between the sulfuric acid and
the lead deteriorates. The electrolyte level should
normally be about 15 mm above the top edge of
the electrodes. Normal tap water often contains
chlorine and ions in different forms, which can
damage the battery. Water must therefore be
topped up using special battery water that has
been distilled.

14.5 Why Must the Battery be Charged?

A battery does not create electricity, it stores it. In
order for the battery to deliver its electricity, it must
be charged with current. The batteries must be
kept well charged to attain their maximum service
life. If a battery is left uncharged or under half
charged for a long time it will be damaged. When
a modern battery is not used and when it is not
connected, it will self-discharge at about 0.1-0.4 %
per day. The warmer it is, the more the discharge
increases. To compensate for this decline, the
battery must be charged. When a battery is
mounted in the machine, all the batteries must be
completely disconnected from current consumers,
consequently key OFF. It is also essential no extra
equipment is fitted that can draw current from the
batteries even when the key is OFF. In order to
attain maximum service life from a battery, it is
preferable to charge it a few times every year. If
the machine is put away in storage, the battery
must first be fully charged. To get the longest
possible storage time, the batteries must be kept
as dry and cool as possible. Modern batteries
should be charged at least every five months, and
if the machine is stored for the summer, at least
every four months.
Top up each cell with battery water to the level
of the arrow (about 15 mm above the top of the
electrodes).
Batteries and maintenance
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