It's not normal to charge a battery car for eight hours without a full charge. Generally, you are full of battery cars in about 5 hours, and now 7 hours are not full, which must indicate that there is a problem with the electric vehicle charging system.
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The charging time after the full discharge of the new battery is generally 8 to 12 hours, charging ten hours has not been full can feel whether the battery has fever, if the battery does not heat can continue to charge, until the charger automatically turns green, if the heat should stop charging, Find a dealer to solve the problem of charging heat, charger mismatch or battery quality problems may lead to the failure to automatically turn green.
It may be that the charger power is too small leading to slow charging, or the battery capacity is too large and takes a long time to fill.