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Hello, this can be seen through the charging current or through the observation hole of the maintenance free battery.

Of course, it cannot be distinguished with the naked eye. When measured with a multimeter, as long as the voltage is above 12.5 volts, it is basically fully charged. There is a window on the battery to observe the quality of the battery. As long as the window is green, the battery is good. If it turns black, it needs to be replaced.

The main components that can provide electrical energy for lead-acid batteries are the positive and negative plates and electrolyte. There is a liquid port plug on the battery, which is used to discharge the gas generated during charging, supplement pure water, and measure the specific gravity.

Accurate measurement generally relies on calculating the specific weight to confirm whether the battery is fully charged. The specific gravity of battery fluid and the condition of the battery are:

1. Adequate battery: 1.2750-1.285;

2. Discharge rate is 30%: 1.170-1.190

3. The discharge rate is 100%: 1.050-1.070.

If it is a maintenance free battery (without a liquid port plug and does not require distilled water during its service life), it needs to be determined whether it is fully charged based on the form of discharge float voltage. The nominal voltage of a single battery is 12V, and in the float charging state, the voltage of an acidic battery is 13.5-14.5V, which can be considered fully charged (inaccurate). The open circuit measurement voltage will basically reach 16-17V, and the battery is considered fully charged at this time.

Can be charged, the so-called maintenance free battery refers to a battery that does not require maintenance or frequent addition of electrolyte during normal use. Other uses are no different from regular batteries, and as for charging, there is no need for special deflation. The battery is designed with exhaust holes at the factory and is usually placed in the car. As long as the engine is started, the battery is always in a charging state. In addition, the battery needs to be disassembled for charging. It is best to use a dedicated battery charger to avoid damaging the battery. If your car battery runs out of battery after only a month of use, you can consider whether the car's power generation has malfunctioned, resulting in insufficient or no power generation, usually due to damage to the generator or silicon rectifier. Suggest checking to avoid significantly reducing the lifespan of the new battery due to long-term power loss. Maintenance free battery charging time after running low: 20 hours.

For example, the 12V60Ah charging method adopts a constant voltage and current limiting method for charging, with a constant voltage of 14.8V and current limiting of 15A for 16 hours, followed by a constant current of 3A for 4 hours, for a total of 20 hours.

Expanding Information

Battery charging principle:

The principle of charging is that the voltage of the charger is higher than the voltage of the battery in order to charge. The larger the difference in electromotive force between the two, the faster the charging, and the greater the charging current.

So the maximum voltage (no-load) of a typical 24V charger is 28V, while 60A refers to the output current capacity at full load. When you charge, the charger already has a load, and the voltage at this time is the voltage at which the battery is charging. The current at 40A is the charging current, which will gradually decrease as the charging is completed. In addition, the size of the charging current is also related to the capacity of the battery

When the battery is severely depleted, it needs to be replenished in a timely manner. Relying solely on the charging capacity of the car itself is not enough, so a portable charger can only be used to charge the battery. Charging the car's starting battery takes 20 hours.

For example, the 12V60Ah charging method adopts a constant voltage and current limiting method for charging, with a constant voltage of 14.8V and current limiting of 15A for 16 hours, followed by a constant current of 3A for 4 hours, for a total of 20 hours.

A fully charged battery can be judged based on the following phenomena:

1) A large number of bubbles are generated inside the battery, resulting in boiling phenomenon;

2) The terminal voltage rises to its maximum value and does not rise again within two hours;

3) The electrolyte rises to its highest level and does not rise again within two hours.

Or observe the electric eye, the fully charged state can be determined by the green color of the electric eye.

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