Experts, critics, specialists and even users have said a lot regarding the NiCd batteries that power a plane, however, the fact is, few advices are conflicting. Truthfully, there is a lot associated with these batteries and one has to be very careful while taking care of them.
If we attribute towards “memory effect” then it is the most perpetuated myth in NiCd history that occurs when only one part of the battery is repeatedly coming into use before the recharging process. Earlier, memory effect was common; however, it only occurs when charge and discharge cycles are of the same length.
Usually, the problems suffered by the cells are because of “voltage depression.” It is not caused due to charging a battery before the full discharge but by overcharging. The sole reason why people think that only a fully discharged battery should be charged, because then only you can notice the precise time it takes to get fully charged. The chargers generally used by the battery owners’ charges a battery at a constant speed and it’s your duty to remove the charger at the appropriate time so that it won’t encounter any problem because of the overcharging.
Remember, a recharge after a partial recharge demands less time so it’s better you charge the battery within a specific interval of time. We think that overcharging only reduces the life of the battery; however, it also diminishes the average current rate that a battery actually necessitates. Voltage depression is easy to cure but you ought to be a bit careful. By merely following the pattern mentioned below, you battery will never stumble upon voltage depression:-
Complete Discharge –> Complete Charge = Voltage returns to normal levels
You may don’t know but there are two predominant ways of charging a battery: slow and fast.
Universally, slow recharging is done at C/10 rate that theoretically takes around 10 hours to recharge your NiCd and NiMH batteries. But due to charging inefficiencies, the charging time increases upto 14 hours. Continuous charging produces heat so it’s better you plug out the charger after 14 hours. Fortunately, in slow charging, the voltage speed is relatively slower that is why overcharging doesn’t affect your batteries at all otherwise overcharging in the fast process can damage your NiCd and NiMH battery.
There are various rates on which fast charging are normally done. Ranging from C/2 to 5C, fast charging also depends on the capacity of your battery as well. Those who love their batteries must keep a check on the charging time because the cells will not tolerate overcharging at high voltage. You can even use the latest chargers to charge on high voltage that automatically stops charging once the battery is fully charged. This step will maintain the capacity and efficiency of your battery and will keep you tension free.