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Why the battery voltage is 12.5V, and cannot be charged?

Other than charging for the first time, the controller detects the recharging voltage is too low when the system is not disconnected. The current 12.5V which makes the controller determine that there is sufficient voltage. Thus, it will not start the charging function. If you want to charge, you can disconnect the battery then connect again.

Mona is the author of this solution article.

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