1997 Yamaha YFM600FWAK ATV Service Manual, Page 102Get this manual
BATIERY INSPECTION (V)
13.0 12.5 12.0
Relationship between open-circuit voltage and charging time at 20'C (sa'F)
Check the condition of the battery using the following chartsExample: Open-circuit voltage12.0V Charging time6.5 hours Charge condition of the battery20 30 .Charging method for MF batteries
6.5 10 Charging time (Hours)
This varies depending on the temperaturethe state of charge in battery plates and the electro Iyte level
If it is impossible to set the standard charging current, be careful not to overcharge When charging the battery, be sure to remove it from the motorcycle(If charging has to be done with the battery mounted on the motorcycle, be sure to disconnect the wire at the negative terminaL) Never remove the sealing caps of an MF battery Make sure that the charging clips are in full contact with the terminal and that they are not shorted together(A corroded clip on the charger may cause the battery to generate heat in the contact areaA weak clip spring may cause sparks Before removing the clips from the battery terminals, be sure to turn off the charger's power switch The open-circuit voltage variation for the MF battery, after charging, is shown belowAs shown in the figure, the opencircuit voltage stabilizes about 30 minutes after charging has been completedTherefore, wait 30 minutes after charging is completed before measuring the opencircuit voltage