Battery upgrade.

[JPaul]

I went with a Duracell AGM from Sam's Club in the red H3 when the old battery died, it's done really well. Even after leaving the red H3 sitting for a few months it started right up. I have pics in my build thread I think.

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[EndeavoredH3]

It's four years since I did this repair. Optima battery and new terminals. Some careful trimming of the battery cover and it's worked great for me.


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What is the size on that optima red top? Im ready to bite the bullet on a new battery soon since I now know that the alternator is working harder with the weak battery that I have. At the place I work at I highly recommend getting AGM batteries due to points already said like better heat/vibration resistance and reliability.

 

[650Hawk]

I think my battery of 5 years is starting to go, on my scan gauge the battery seems to sit at around 11.2 volts with the vehicle off. More weak than actually testing bad.

:whaa:At 11.2 volts, your battery is at less than 10% SOC (State of Charge). I'm surprised it hasn't left you stranded.

 

[JPaul]

It's definitely too low, but to check SOC with a voltmeter you need to make sure all loads are disconnected, even a small load will draw the voltage down and give you a false reading. This will also help you make sure there isn't a parasitic draw on it as well that is above normal.

 

[650Hawk]

It's definitely too low, but to check SOC with a voltmeter you need to make sure all loads are disconnected, even a small load will draw the voltage down and give you a false reading.

True, but a normal small load won't draw a healthy battery down to 10% SOC.

 

[humvee]

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Image saved, clean work