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: Drive shaft (atx) disassembly/assembly
1. Disassemble in the order indicated in the table.
2. Assemble in the reverse order of disassembly.
Boot Band (Wheel Side) Disassembly Note
Note
The boot band does not need to be removed unless it is being replaced.
Remove the boot clamp with end clamp pliers as shown and discard the
cla ...
Mazda 6 Owners Manual: Oil pressure switch inspection
1. Verify that the oil pressure warning light illuminates when the ignition
switch is at ON position.
2. Verify that the oil pressure warning light goes off when the engine is
started.
If the oil pressure warning light does not illuminate or remains
illuminated, inspect the related wirin ...