- Yuasa Battery, Inc. Automobile Battery Charger User Manual

The single most important thing to maintaining a sealed
VRLA battery is don’t let it sit discharged:
keep it fully charged. A sealed VRLA motorcycle
battery should be kept to near fully charged for peak
performance. In fact, it can need charging more often
than a car battery because it’s probably not used routinely
and, therefore, not “automatically” charged.
Use the following guidelines for boost charge. Always
verify battery condition before charging, and 30 minutes
after charging.
●
A fully charged battery should read 12.8v or higher after
battery has been off the charger 1 - 2 hours.
Routine Charging
OVERCHARGING CAN HARM YOUR BATTERY BEYOND
RECOVERY.
A word on overcharging: don’t. Because of the charac-
teristics of a sealed VRLA battery, too much of a boost
charge will decrease the volume of electrolyte. The
longer the overcharge time, the greater the drop in elec-
trolyte – and starting power.
Water can’t be added to the sealed VRLA battery to make up
the difference. Overcharging can warp plates, making
future charging difficult or impossible. Watch charging times
carefully, or ideally, use a Yuasa Automatic Charger. Always
stop charging if the battery becomes really warm to the
touch. Let it cool down 6 - 12 hours and resume charging.
32
Caution:
Always wear safety glasses and charge in a ventilated area. If battery gets really warm to the touch, discontinue
charging and allow battery to cool down. No sparks, flames or smoking when charging.
State Charge Time
*
of Voltage Action (Using a constant
Charge current charger
@ std. amps specified
on the battery)
100% 12.8v - 13.0v None
Check at 3 months None Required
from date of
manufacture
75% -100% 12.5v - 12.8v May need slight
charge, if no 3 - 6 hours
charge given,
check in 3 months
50% - 75% 12.0v - 12.5v Needs charge 5 - 11 hours
25% - 50% 11.5v - 12.0v Needs charge At least 13 hours
verify state
of charge
0% - 25% 11.5v or less Needs charge 20 hours
(see special instructions
on page 33)
*
Charging times can vary depending on type of charger. Follow the charger’s instructions.
5
SECTION
Sealed VRLA
Batteries