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.
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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