KTM 690 Enduro R Owner's Manual page 131

ELECTRICAL SYSTEM
Info
Even when there is no load on the battery, it still loses power steadily.
The charge state and the type of charge are very important for the service life of the battery.
Rapid recharging with a high charging current shortens the battery's service life.
If the charging current, charging voltage and charging time are exceeded, electrolyte escapes through the safety valves. This
reduces the battery capacity.
If the battery is depleted from starting the vehicle repeatedly, the battery must be charged immediately.
If the battery is left in a discharged state for an extended period, it will become over-discharged and sulfate, destroying the battery.
The battery is maintenance-free, which means that the acid level does not need to be checked.
Preliminary work
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Switch off all power consumers and switch off the engine.
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Remove the seat. ( p. 82)
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Remove the battery. x ( p. 126)
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