A low level of electrolyte fluid will cause the battery to discharge quickly.

Inspect the electrolyte level at least once a week. If it is low, remove the caps and add enough distilled water to bring the level between the upper and lower level (illustration).
Do not overfill.
Examine the specific gravity of the electrolyte with a hydrometer, especially during cold weather. If it is low, recharge the battery.
Battery Maintenance
Battery RechargingMazda 6 Owners Manual: Wheel and tire
WHEEL BALANCE ADJUSTMENT (16 INCH AND 17 INCH ALUMINUM ALLOY WHEEL)
Caution
Adjust the outer wheel balance first, then the inner wheel
balance.
Be careful not to scratch the wheels.
Adhesive-type Balance Weight (Outer)
1. Remove the old balance weight from the wheel.
2. Remove the dou ...
Mazda 6 Owners Manual: Engine tune-up
IGNITION TIMING INSPECTION
Note
Ignition timing is not adjustable.
Ignition timing verification requires WDS or equivalent.
1. Turn off the electrical loads.
2. Warm up the engine as follows.
(1) Start the engine.
(2) Maintain the engine speed at approx. 3,000 rpm until the
cooli ...