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The discharge cutoff voltage of lead-acid batteries varies with the discharge current. Its value is not fixed.

Assuming the standard discharge current of lead-acid batteries is C (such as a 60AH battery, C=60A):

When the discharge current I=<0.05C, the cut-off voltage of the single cell battery is 1.9V, and the discharge cut-off voltage of the 12V battery is 11.4V;

When the discharge current I=0.1-0.3C, the cut-off voltage of the single cell battery is 1.8V, and the discharge cut-off voltage of the 12V battery is 10.8V;

When the discharge current I=0.4-0.5C, the cut-off voltage of the single cell battery is 1.75V, and the discharge cut-off voltage of the 12V battery is 10.5V;

When the discharge current I=0.6-3C, the cut-off voltage of the single cell battery is 1.6V, and the discharge cut-off voltage of the 12V battery is 9.6V.

The termination voltage of a single cell battery is 2.7-2.8V, which means that the maximum (no-load) voltage of the charger can be 16.8V. Due to the uncertainty of the internal resistance of the power supply and battery, this voltage can also be slightly higher, but it must be strictly monitored based on the actual charging situation of the power supply and battery. Otherwise, it is easy to damage the battery.

For the power supply, no-load means the output is suspended without using any electrical appliances.

If the battery voltage is lower than 10.5 volts, it needs to be charged. The battery cannot be fully discharged, which has a significant impact on the battery life

The discharge cutoff voltage of lead-acid batteries varies with the discharge current. Its value is not fixed.

Assuming the standard discharge current of lead-acid batteries is C (such as a 60AH battery, C=60A):

When the discharge current I=<0.05C, the cut-off voltage of the single cell battery is 1.9V, and the discharge cut-off voltage of the 12V battery is 11.4V;

When the discharge current I=0.1-0.3C, the cut-off voltage of the single cell battery is 1.8V, and the discharge cut-off voltage of the 12V battery is 10.8V;

When the discharge current I=0.4-0.5C, the cut-off voltage of the single cell battery is 1.75V, and the discharge cut-off voltage of the 12V battery is 10.5V;

When the discharge current I=0.6-3C, the cut-off voltage of the single cell battery is 1.6V, and the discharge cut-off voltage of the 12V battery is 9.6V.

Recharging a lead-acid battery after over discharge results in a rapid decrease in open circuit voltage

Because there was a power outage at night, I removed a 12V battery from the electric vehicle and connected it to a light bulb for illumination. I forgot to turn it off, but on the second day, I found that the light bulb was no longer on. After removing the light bulb, I measured the voltage with a multimeter to be only about 7V. Then, I used a charger to charge the battery separately. When the voltage reached 14V, I removed the charger and reinstalled it with the three sets of batteries for charging. However, the voltage of this battery was always lower than the three sets of batteries by about 0.5V. To restore the capacity of the discharged battery, it needs to be overcharged

When you charge to 14V, the online voltage is reached, but it is not actually overcharged

I suggest that you recharge this battery separately. The charging voltage should be a constant voltage of 15V, and the time should be controlled within 16 hours. Remember, it is a constant voltage charging

The other three batteries are also charged at a constant voltage of 15V for 12 hours, which can flatten the batteries

Your excessive discharge can cause damage to the battery, which is vulcanization. Generally, vulcanization is difficult to recover through charging. So it may not be possible to restore to the state of the other two. You can give it a try as suggested by the upstairs. If you die, become a living horse doctor!

Cell represents the single cell of the battery, with a voltage of approximately 2V per cell; A 12V battery has 6 cells, and the termination voltage is 6 times the termination voltage of the cells; A 6V battery has three cells, and the termination voltage is three times the termination voltage of the cells; Other analogies;

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