One of my friend did 200km on a swift gt with no alternator belt on a freshly charged battery (he was 200km away from home)...
Of course he had a spare one in the back.
He did that on a standart car battery so a deep cycle could go farther between charge.
Deep cycle battery can be bought under 100$ so I don't think it's a good idea to buy a used one.These won't fit also in your battery tray as the civic's one is really small.
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