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I'd buy a true deep cycle battery that fits in the same spot as your existing car battery. It'll handle the deeper discharging unlike a normal starting or hybrid starting/deep cycle battery. I never had an issue with my deep cycle batteries not having enough oomph to start my car in the dead of winter.
No need to break the wallet either, should be under $100.
If you're looking to go alternatorless, I'd go for the biggest one that fits.
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