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Message: <blockquote data-quote="ciklee" data-source="post: 725350" data-attributes="member: 22701">From what I've been told, if you're changing to the same battery spec as the original, it is advisable to program the new battery in, basically clear the existing battery charging profile so the alternator would not overcharge the new battery, which may reduce its lifetime. If you're changing to different battery spec, then you need to code the new battery i.e. tell the ecu that the new battery has different properties so the proper charging profile can be applied.Some may argue that programming/coding the battery is not needed but I believe it does help in ensuring the battery is optimally charged. I'm still on my original battery as it left the factory, and that was 10 years ago.</blockquote>