A voltage reading of 12.2 volts for a motorcycle battery typically indicates a battery that is partially discharged or in need of charging. While it may not necessarily mean that the battery is bad, it does suggest that the battery's charge level is low.
A fully charged motorcycle battery should ideally have a voltage reading between 12.6 and 13.2 volts. As a general guideline, a voltage reading below 12.4 volts is considered low and indicates that the battery may require charging.
To accurately assess the condition of a motorcycle battery, it's important to measure its voltage after it has been fully charged and allowed to rest for a few hours, preferably without any load connected to it. If the voltage remains significantly below the recommended range even after a full charge, it could indicate that the battery is deteriorating or has other underlying issues.
If you consistently experience difficulties starting your motorcycle or notice other signs of battery-related problems, such as slow cranking or dim lights, it is advisable to have the battery tested by a professional. They can perform a load test and assess the battery's overall health to determine if a replacement is necessary.