subject: Repeated Charge And Discharge The Battery The Capacity Will Be Down To 80% Of Rated Capacity [print this page] Usually nickel-cadmium batteries are used as in the application of repeated charge and discharge of the cyclical work, battery life is limited, the capacity can not always maintained and not fall, under certain conditions of work after repeated charge and discharge the battery The capacity will be down to 80% of rated capacity (or defined at 60%). This number is called repeatedly charge and discharge cycle life, cycle life, said the higher the longer the battery life. Some of the battery will be above the reference standard indicated charging and discharging cycles, the number of depth of discharge written about how many times, life cycle intention. With the charge and discharge current, discharge depth and other conditions of the different charge and discharge, cycle life expectancy with the changes, especially when using high current discharge must have shortened life expectancy phenomenon. now nickel-cadmium batteries in accordance with the time of purchase as long as the manufacturers instructions accompanying the normal use, usually can be repeatedly used 500 times.
Battery internal resistance and voltage
Battery is internal resistance of voltage source, can be seen as an ideal voltage source (no internal resistance) in series a resistance output. Missed both ends of load capacity to the battery terminal voltage is ideal voltage source of voltage, called the open voltage, when the battery is an external load, the load resistance in series with the receipt of an ideal voltage source, so the load on the resulting partial pressure is the battery terminal voltage will be less than the ideal voltage source of voltage, called the closed-circuit voltage. The higher the internal resistance of the battery can share the load voltage is smaller, so the battery is not the ideal resistance.
Nickel-cadmium battery's internal resistance is very low, generally only a few cents to tens of milliohms or so ohms, so the size difference between external load is very stable discharge voltage, discharge current curve is very flat, you can enlarge the current discharge. General dry battery internal resistance tens of ohms, the discharge voltage instability in the discharge current curve is not flat, compared to nickel-cadmium batteries are the ideal characteristics of the battery.
Self-discharge
Battery due to internal chemical reaction will be from the relationship between the self-discharge inside, though not an external load, but the electricity stored in batteries will gradually disappear over time. Self-discharge rate is called self-discharge rate, ambient temperature, the higher the self-discharge the greater the current. According to experts, the results of experiments, nickel-cadmium battery in about three months at 0 will discharge the remaining 20% to 80% residual capacity, about one month at 20 and 25% of discharge, discharge 40 months %, if the higher the temperature 45 , 70% a month already let go of the capacity. Therefore, in the summer, fully charge the battery as long as a few days after the time, capacity on the remaining 80% or even 50% of the No wonder experts suggest that's worth the tears of the divorce bill, the best way is to save battery sealed properly packaged and placed in cold storage refrigerator (not wet), not without reason. Battery
