Why the lead acid batteries should not to discharge beyond 1.75 volt?

Answer: The lead acid battery should never be allowed to discharge beyond 1.75 volt otherwise it will be formed on the electrode which is hard, insoluble and increase the internal resistance of battery.

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Lead acid discharges to 1.75V/cell; nickel-based system to 1.0V/cell; and most Li-ion to 3.0V/cell. At this level, roughly 95 percent of the energy is spent, and the voltage would drop rapidly if the discharge were to continue. To protect the battery from over-discharging, most devices prevent operation beyond the specified end-of-discharge voltage.

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