Yuasa Battery YUMICRON YUA00ACC05 - Manual (Page 35)

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Batteries with voltage below 11.5v may require special
equipment and procedures to recharge.
In charging an overdischarged battery having a terminal
voltage of 11.5v or lower, its internal resistance may be
too high to charge at a normal charge voltage.
Therefore, it may be necessary to raise the voltage of
the battery initially (25v as a maximum), and charge
for approximately 5 minutes. If the ammeter shows
no change in current after 5 minutes, you need a new
battery.
Current flowing into the battery at high voltage can
become excessive. Monitor amperage and adjust voltage
as necessary to keep current at the battery’s standard
amp rating. Charge for approximately 20 hours.
Charging Instructions for Sealed VRLA Batteries
with Voltage of 11.5 or Less
How to determine battery condition
after boost charge.
Determine the condition of a sealed VRLA battery at
least 1 - 2 hours after the charge by measuring the
terminal voltage according to the table below.
Criteria Judgement
12.8v or higher Good
12.0 -12.8v or lower Charge insufficient → Recharge
12.0v or lower Unserviceable → Replace
Adjust voltage so that current will be at
standard amps after 5 minutes.
Check voltage periodically using a
voltmeter.
● Recommended every 3 months from date of activation,
or 3 months from date of manufacture for batteries
activated at the factory. Keep in mind, higher storage
temperatures cause faster self-discharge and require
checking more often.
● If you plan to store your vehicle for an extended time,
make sure your battery is fully charged.
● Fully charged should read 12.8v - 13.0v after standing
1 - 2 hours.
● When a battery is in storage, check and charge it if
the voltage drops below 12.5v for YTX batteries.
Beyond that, maintenance is the same as for any battery,
except you don’t have to worry about electrolyte:
● Keep the battery top free of grime.
● Check cables, clamps and case for obvious damage
or loose connections.
● Clean terminals and connectors as necessary.
● For storage, pull battery or disconnect battery cable.
Routine Maintenance for
Sealed VRLA Batteries
5
SECTION
Sealed VRLA
Batteries