Some of Nicad batteries can present problems whose recovery may be tried with some simple procedures. One of them is the loss of energy storage capacity. A battery or more than one in a set beginsto show signs of exhaustion before the other, showing that it does not completely retain the charge.
This may be due to what is called "memory effect" that most modern Nicad batteries shows no more. For this purpose, the battery, if charged with certain load, not can be recharged back to the maximum, but only up to a certain value that does not correspond to its maximum. One way to try to recover this cell is as follows:
a) totally Exhaust stack ligand to a 1.5V or 3.0V lamp as shown in Figure 1.
b) Recharge the battery in the normal time.
c) Download again the battery and charging.
d) Repeating this procedure three or four times the normal performance of a cell can be recovered.
If this does not resolve or if the battery manifest signals of short or fully open (does not circulate recharging current), make a brief attempt to recharge (minutes) with the reverse current by checking the instant it begins to circulate.
When this occurs, change the polarity of the charger and pass the normal charge. Never put in short the terminals of the battery or leave to pass excessive load current as this can cause an explosion.
