what's mean Depth of Discharge?

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what's mean Depth of Discharge? by mary lv

what's mean Depth of Discharge?

what's mean Depth of Discharge?
The typical end-of-discharge voltage for nickel-based <A

href="http://www.good-battery.co.uk">batteries </A>is 1V/cell. At that

voltage level, about 99 percent of the energy is spent and the voltage starts

to drop rapidly if the discharge continues. Discharging beyond the cut-off

voltage must be avoided, especially under heavy load.
Since the cells in a <A href="http://www.good-battery.co.uk">battery </A>pack

cannot be perfectly matched, a negative voltage potential (cell reversal)

across a weaker cell occurs if the discharge is allowed to continue beyond

the cut-off point. The larger the number of cells connected in series, the

greater the likelihood of this occurring.
A NiCd <A href="http://www.good-battery.co.uk">battery </A>can tolerate a

limited amount of cell reversal, which is typically about 0.2V. During that

time, the polarity of the positive electrode is reversed. Such a condition

can only be sustained for a brief moment because hydrogen evolution occurs on

the positive electrode. This leads to pressure build-up and cell venting.
more info:<A href="http://www.good-battery.co.uk">www.good-battery.co.uk</A>

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