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On my original point. Are there any issue with connecting 2 batteries to the same car in parallel?
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No issues as long as both batteries are healthy and similar. You don't want a battery on it's last legs together with a new battery. It might be OK but I would not risk bad battery dragging the good one down. Also calcium, silver, AGM batteries seem to have a bit higher voltage so paired with plain lead battery they would charge/discharge at different rates.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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