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Best Group 31 AGM Cranking Batteries for Cummins ISB 6.7 Diesel RV

For Cummins 6.7 ISB, use AGM Group 31 batteries with 900+ CCA. Duracell (East Penn) and NAPA Legend are both excellent choices with good warranty. Replace both batteries together. AGM handles diesel starting demands better than flooded.

Solar Batteries Medium 30-45 minutes for testing 8

AGM Battery Deep Discharge Damage - East Penn 6V Recovery

Your East Penn 6V AGM batteries likely sustained some damage from the complete discharge to 8V, but your charging behavior suggests they may have recovered reasonably well. The key indicators are how they hold voltage under load and their actual capacity.

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