My VW Jetta's Blaupunkt radio/CD unit is 14 years old, but is "married" to the vehicle, so that if I have to disconnect the battery for any reason it re-initialises itself after reconnection. Saves a lot of fiddling about!
Although the Jetta is still featuring its original exhaust system, I replaced the Varta battery after nine years even though it was still in good working order. A harsh winter had been forecast, so I did a swap and gave it to a friend who was fettling up an old Toyota sports car. The battery is still going strong apparently.....
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Flat battery new