Quote:
Originally Posted by vwnate1
I usually only get 5 ~ 6 years out of my Diesel Merc. batteries, they work and test fine until they don't, usually far from home in the Desert during a protracted 100 + degree road trip ..
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Depends very much on the vehicle. Batteries don't like high heat or vibration. AGM batteries especially don't like the heat.
In w210 with the battery under the back seat, it is pretty well insulated and protected, getting 10 years out of a w210 battery is not unusual at all. As a data point, I once owned a '97 w210 that I bought used. I owned the car for 10 years exactly before selling it. I never replaced the battery - whatever was in it at purchase was still going strong when I sold the car 10 years later.
In w123 with battery sitting inches from the scorching hot turbo and exhaust manifold, I would not expect batteries to have a long life. AGM would be a poor choice in w123.
As for charging, any of the modern "smart" chargers are designed to accommodate multiple chemistry types including AGM.