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Nobody can help you without knowing what mount you want to drive, and what accessories if any, you want to power. You would need a 5 amp output
to comfortably run something in the HEQ5/ NEQ6 size range.
For 40 years I used old car batteries from my my local auto electrician,
usually free, but sometimes a few dollars. They would be fine for two or three years, and then I'd get another one.
raymo
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