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I used AGM 75hr/amp battery. They are more expensive, but well worth it.
They are safe and excellent to use in a mobile environment due to their abililty to be oriented in any position even can be kept inside because no gas venting unlike RV/Marine lead acid batteries.

Yes, you can almost go bowling with them.lol They have to be tough and durable if UPS will ship them. Excellent choice. I will follow you to keep updated on your journey. Looking ahead to interact with @quadratactical