Start stop not ready / battery charging message after aux battery change - What next?

[ATX_Jeeper]

Mine ended up being the main battery but I didn't find that out until after I replaced the aux battery. Have them properly tested or replace them both.

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[scotticus]

Mine ended up being the main battery but I didn't find that out until after I replaced the aux battery. Have them properly tested or replace them both.

Same issue, replaced my main battery, ESS works now. I didn't touch the aux battery