Interstate are the standard. So don’t get confused...
When talking about batteries, other people use Walmart brands with great success. Their reasoning with warranty and price is advantageous. Would I ever buy them? No, no sir I wouldn’t.
I have a set from sams club - buddy gave them to me. Duracell gel batteries. They were under warranty within just one year.
What batteries do I run? Only yellow top. You have interstate batteries - you good. Maybe one is weak. Maybe connections are chitty. You need to get the voltage with them disconnected. If they good and are both same voltage, it’s in your cables - perhaps deteriorating.
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~Don’t overthink something simple~
...:uptight people suck:...