What is The Best Right Charging Voltage of Lead Acid Battery?

As for lead acid battery, we always know it is important to maintain them to extend the life. However, just checking the exterior and interior of the batteries is not enough. Overcharge and less charging will shorten the life of lead acid batteries. So we always need to give these batteries fully charging. But what's the right voltage of these batteries?

Anything above 2.15 volts per cell will charge a lead acid battery, and this is the voltage of the basic chemistry. However, a higher voltage is used most of the time because it forces the charging reaction at a higher rate. The voltage to avoid is the gassing voltage, which limits how high the voltage can go before undesirable chemical reactions take place. The typical charging voltage is between 2.15 volts per cell (12.9 volts for a 6 cell battery) and 2.35 volts per cell (14.1 volts for a 6 cell battery). These voltages are appropriate to apply to a fully charged battery without overcharging or damage. If the battery is not fully charged, you can use much higher voltages without damage because the charging reaction takes precedence over any over-charge chemical reactions until the battery is fully charged. This is why a battery charger can operate at 14.4 to 15 volts during the bulk-charge phase of the charge cycle.

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The basic lead acid battery is ancient and a lot of different charge methods have been used. In the old days, when voltage was difficult to regulate accurately flooded lead acid batteries were important because the water can be replaced. The lead acid chemistry is fairly tolerant of overcharging, which allows marketing organizations to get to extremely cheap chargers, even sealed lead acid batteries can recycle the gasses produced to prevent damage to the battery as long as the charge rate is slow. We offer a range of chargers from inexpensive to very sophisticated, depending on the requirements of the customer, but all of the chargers we sell off-the-shelf are highly regulated sophisticated chargers that cannot overcharge the battery.
Some lead acid batteries are used in a standby condition in which they are rarely cycled, but kept constantly on charge. These batteries can be very long lived if they are charged at a float voltage of 2.25 to 2.3 volts/cell (at 25 degrees C) (13.5V to 13.8V for a 12V battery). This low voltage is to prevent the battery from losing water during long float charging. Those batteries that are used in deep discharge cycling mode can be charged up to 2.45 volts/cell (14.7V for a 12V battery) to get the highest charge rate, as long as the voltage is dropped to the float voltage when the charge is complete.

Note that a fully discharged battery freezes solid at about 0°C, a fully charged battery freezes about -40°C. This is why a discharged battery won't take a charge in sub-freezing weather.
The right charging of a lead acid battery is as important as proper maintenance. So you also require the knowledge of this article at the same time you need to know how to maintain these batteries. Don't use the improper charger or voltage to charge the lead acid battery, otherwise they will damage these batteries. Be careful no matter whether you charge or maintain the lead acid battery.

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