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: Sst
Some Ford SST or equivalent are used as SSTs necessary for
engine repair. Note that these SSTs are marked with Ford SST
numbers.
Note that a Ford SST number is written together with a
corresponding Mazda SST number as shown below.
Example (section ST)
Example (except section ST)
...
Mazda 6 Owners Manual: Windshield installation
Caution
To prevent the sealant from cracking or the glass from being
pushed out by air pressure if a door is closed, open all of the windows and
leave them open until the sealant has hardened.
1. Cut away the old sealant using a razor so that 1-2 mm {0.04-0.07 in}
thickness of sealant ...