Why is the battery in the Toyota GT86 so small?

It appears that Toyota will change the battery in some instances in this model.
http://www.gt86ownersclub.co.uk/forum/flat-battery_topic2085_page1.html

Standard is supposedly a 45A which they replace with a 65A.

Asked on 9 January 2016 by groaver

Answered by Honest John

Seems that the post-production Thatcham alarm/immobiliser fitted sometimes causes a draindown.

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