KTM 690 ENDURO EU Owner's Manual page 108

MAINTENANCE WORK ON CHASSIS AND ENGINE
Info
Even if there is no load on the battery, it loses power every day.
The charge state and the type of charge are very important for the service life of the battery.
Fast recharging with a high charge current shortens the battery's service life.
If the charge current, the charge voltage and the charge time are exceeded, electrolyte escapes through the breathing holes. The
battery capacity is then reduced.
If the battery becomes discharged from starting, it must be recharged immediately.
If the battery rests for an extended time in a discharged state, it becomes over-discharged and sulfated, which will result in its
destruction.
The battery is maintenance-free, i.e., the acid level does not have to be checked.
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Switch off all power-consuming components and switch off the engine.
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Remove the battery. (
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