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: Power outside mirror inspection
1. Disconnect the power outside mirror connector.
2. Apply battery positive voltage to the power outside mirror terminals and
inspect the operation of the power outside mirror.
If not as specified, replace the power outside mirror.
3. Inspect for continuity between the power outside mi ...
Mazda 6 Owners Manual: Front door glass removal/installation
1. Operate the front door glass so that the distance from the top of the
front door glass to the upper part of the rear beltline molding is 210 mm
{8.3 in}.
2. Disconnect the negative battery cable.
3. Remove the front door trim.
4. Remove the hole cover.
5. Remove the screws.
6. Insert ...