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Hello! I also replaced the auxiliary battery along with the main one, Exide was the brand I picked for both, as I used Exide on others cars and there were no problems for years.
 

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Keep in mind that if the auxiliary battery isn't good anymore, the main one is also at half capacity or less. You should consider changing it, or better, go to a repair shop and have it test it. My main battery was at less than 40% of it's capacity.
 
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