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: Vehicle Loading
WARNING
Do not tow a trailer with this vehicle: Towing a trailer with this
vehicle is dangerous because it has not been designed to tow a trailer and doing
so will affect the drive system which could result in vehicle damage.
This section will guide you in the proper loading of your vehicle, t ...
Mazda 6 Owners Manual: Trunk lid removal/installation
Warning
Removing the stay damper without supporting the trunk lid can be
dangerous. The trunk lid may fall and injure you. Open the trunk lid fully
and support it before removing the stay damper.
1. Disconnect the negative battery cable.
2. Disconnect the trunk lid harness connector, p ...