2003 Suzuki LT-Z400 Factory Service Manual, Page 277Get this manual
SERVICING INFORMATION
BATTERY
Complaint Sulfation or spots on surfaces of cell platesBattery runs down quicklySymptom and possible causes
1Cracked battery caseReplace2Battery has been left in run-down condition for long ReplacetimeCheck the generator, and regulatorrectifier circuit connections, and make necessary adjustments to obtain specified charging operation2Battery cell plates have lost much of their active mate- Replace the battery and correct the charging systemrial as result of overcharging3Internally shorted batteryReplace4Old batteryReplace