Polaris PRO XD Owner's Manual page 144

MAINTENANCE
STATE OF
CHARGE
25%-50%
0%-25%
*(Using constant current charger @ standard amps specified on top of battery)
142
VOLTAGE
11.5-12.0 volts
11.5 volts or less
ACTION
Needs charge
Needs charge
with desulfating
charger
CHARGE TIME*
At least 13 hours,
verify state of
charge
At least 20 hours