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Lowest Voltage for AGM?

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Currently I have two XS power batteries; D5100R under the hood and a D3400 in the trunk.

If I am playing music with the car off, what is the lowest voltage I can reach before causing damage to the batteries? 

I have a little stinger volt meter and analog one to watch it when the cars off. 


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Realistically around 11.7-8v without load if you still want to be able to start your car. Accounting for key on draw, I'd avoid going below 11.4 range.

Don't forget to charge your batteries at home doing this. The alternator won't fully juice the things up after a deep discharge

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