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Hi Eris,
I have been using standard car batteries for years without issue. Standard car batteries are not designed to be run from full charge to discharge cycles on a regular basis and this can reduce battery life. I have only found this to be the case if you don't recharge after use and leave the battery flat for a few weeks. This is a common problem with jumpstart porta packs, you have to keep these charged up.
Deep cycle batteries are designed for this purpose but are more expensive. My current portable battery is a $60 Repco standard car.
I guess it comes down to your budget and how often you are going to use it.
Rick
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