Polaris 2016 INDIAN Chief Classic - Manual (Page 126)

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Maintenance
Battery Charging
If your motorcycle will not be used for a period of four (4)
weeks or longer, a maintenance charger should be
connected to the battery. A maintenance charger can be
purchased through your authorized INDIAN MOTORCYCLE
dealer.
1. Following the charger manufacturer’s instructions, use a
battery charger designed for use with 12-volt batteries.
The charger should have a maximum charging rate of
1.8 amps. Charge the battery for approximately 10
hours at a rate of 1.8 amps. If you use a taper or trickle
charger, it will take longer to charge the battery.
2. After charging the battery, allow the battery to sit 1-2
hours before checking the state of charge with a DC volt
meter. The charge should be a minimum of 12.5 DC
volts. Repeat the charging cycle if the charge is less than
12.5 DC volts. Replace the battery if it fails to reach 12.5
volts after the second charge.