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Hi mate, I would be getting that battery out of the vehicle and away from anything of value until someone on here can give better advice.
As discussed, It may be your regulator on your alternator overcharging your battery as it happened to me but it nearly exploded at only 15 volts. 17.63 is huge mate and I would very very careful. I didn't even know it could get up that high without blowing some cells at least.
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