Chapter 9 Electrical System
2. Battery
. 4LHA Serit
2-4 Charging
2-4.1 Charging
methods
There are two methods of charging a battery: normal and
rapid.
Rapid
charging should only be used in emergencies.
• Normal charging...Should be conducted at a current of
1/10 or less of the indicated battery
capacity (10A or less for a
lOOAH
battery).
• Rapid charging...Rapid charging is done over a short
period of time at a current of 1/5 ~
1/2 the indicated battery capacity
(20A ~ 50A for a
lOOAH
battery).
However, since rapid charging
causes
the electrolyte temperature
to rise too high, special care must
be exercised.
2-4.2 Charging
procedure
(1) Check the specific gravity and adjust the electrolyte
level.
(2) Disconnect the battery cables.
(3) Connect the red clip of the charger to the (+) battery
terminal and connect the black clip to the (-) terminal.
Charger
(4) Set the current to 1/10 ~ 1/5 of the capacity indicated
on the outside of the battery.
(5) Periodically measure the specific gravity during
charging to make sure
that
the specific gravity
remains at a high fixed value. Also check whether
gas
is being generated.
2-4.3 Charging
precautions
(1) Remove the battery caps to vent the gas during
charging.
(2) While charging, ventilate the room and prohibit
smoking,
welding, etc.
(3) The electrolyte temperature should not exceed
45
0
C
during charging.
(4) Since an alternator is used on this engine, when
charging
with
a charger, always disconnect the battery
(+) cable to prevent destruction of the diodes.
(Before disconnecting the (+) battery
cable,
disconnect
the (-) battery cable
[ground
side].)
Specific
gravity i.26
1.23
0 10 20 30
Electrolyte temperature (
0
C)
Electrolyte temperature and specific gravity
2-5
Battery
storage
precautions
The life of a battery depends considerably on how it is
handled.
Generally speaking, however, after about two
years
its performance will deteriorate, starting will become
difficult,
and the battery will not fully recover its original
charge even after recharging. Then it must be replaced.
(1) Since the battery will self-discharge about 0.5%/day
even
when not in use, it must be charged
1
or 2 times a
month when it is being stored.
6r
Self-discharge/
day(%) 3
2
1
\
50°C
N
40°
C
30
o
C
20°C
1
Number of days after charging
(2) If charging by the engine alternator is insufficient
because
of frequent starts and stops, the battery will
rapidly lose power.
Charge
the battery as soon as possible after it is used
under these conditions.
(3) An easy-to-use battery charger
that
permits home
charging is available from Yanmar. Take proper care of
the battery by using the charger as a set
with
a
hydrometer.
When the specific gravity has dropped to about 1.16
and the engine will not start, charge the battery up to a
specific
gravity of 1.26 (24 hours).
(4) Before
putting
the battery in storage for long
periods,
charge it for about 8 hours to prevent rapid
aging.
Simple
charger
9-5
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