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: Sunroof unit disassembly/assembly
1. Disconnect the negative battery cable.
2. Remove the deflector.
3. Remove the glass panel.
4. Disassemble in the order indicated in the table.
5. Assemble in the reverse order of disassembly.
Slider Disassembly Note
1. Remove the screw.
2. Slide the slider rearward, and remove it fro ...
Mazda 6 Owners Manual: On-board diagnostic test
DTCs Reading Procedure
1. Perform the necessary vehicle preparation and visual inspection.
2. Connect WDS or equivalent to the vehicle DLC-2 16-pin connector located as
shown in the figure.
3. Retrieve DTCs by WDS or equivalent.
Pending Trouble Code Access Procedure
1. Perform the necessary ...