This is what I know and my experience with automotive batteries:

- Batteries have a finite number of deep discharge cycles.

- Batteries often last only 4-5 years. They can last longer.

- Try to install the largest size battery that will fit in the space on the battery tray. Sometimes new car manufacturers install small batteries to save on weight. The larger sizes last much longer.

- The Mercedes manual recommends trickle charging the battery every three months for a car in storage.

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95 E320 Cabriolet, 159K