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To summarize and refine the answers. A fully charged car battery has 126 volts. The higher the CCA rating the greater the starting power of the battery.
At 10 years old its time for a replacement.
141v with engine running. Car failed to start this morning. Voltage is not an indication of a good battery. Same after removing 12v ground from battery replacing but 12vbattery at terminals car OFF reads 123v which is about half charge for what should be a fully charged battery.