Toro Field Pro 6040 Service Manual page 198

Charging the Battery (continued)
Electrical System: Service and Repairs
6. When using a maintainable battery, measure the specific gravity of a battery
cell once per hour beginning three hours before the end of the scheduled
charge.
Note: The battery is fully charged when the cells are gassing freely at a
low charging rate and there is less than a 0.003 change in specific gravity
for 3 consecutive readings.
Page 6–34 Field Pro® 6040
22267SL Rev A