How long should a battery last?

Visionist

Member
Wanting to pre-empt a battery failure and wondering just how long the factory battery (that rhymes lol) is expected to hold-out?
 
Modern batteries don't like it if allowed to go completely flat so I always use a CTEK conditioner if the car is not used for more than a couple of days. The original battery on my 2001 Z3 failed last November so was 13 years old.

Tim.
 
Very recently replaced mine at 10 years old. New ones can be guaranteed up to 5 years so realistically 7 years would be a good target.
 
My old zeds battery is still going strong at 11 years old.
It's been well looked after by either being used or left on a maintenance charger.
 
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