If it can be used, the bile battery only has a small amount of electricity to fill it, because:
1, after the battery is used up, the voltage is lower than 12V, when the voltage will rise to 12v soon after charging, it will not be charged, 2, the charger charging connected to the load will produce a voltage drop, the voltage will be lower than 11v, the voltage is similar to water pressure, low water pressure is not flowing into high water pressure, charging is the same. The 11V charger can be charged with 8-volt and 6-volt batteries. Another charger with an output voltage of 14 volts to 16 volts can be used.