• Be particularly careful not to overcharge Ni-Cd batteries, which can overheat and burst.
• Charge Ni-Cd high-capacity batteries with a charger designed for batteries with a higher capacity (mAh). • Do not use a charger that has an automatic timer cut-off, as it will cut off before the battery is
   fully charged. If the charger has an auto-off feature that will stop charging when the battery is fully
   charged and it does not have a discharging circuit, you can get a full charge by running a second charge    cycle.
• If the charger does not have auto-off, you run the risk of overcharging the batteries. If it has a    discharging circuit, it will discharge the battery rather than completing the charge cycle.
• Be sure and discharge Ni-Cd batteries completely-at least once per month-to avoid creating memory and    reducing battery life.
• Crystal growth can occur when a Ni-Cd battery is recharged before it is fully discharged. The crystal    growth can eventually prevent the battery from discharging beyond that point and/or cause rapid
   self-discharge of the battery. You can avoid crystal growth in the battery by either completely    discharging it each time it is used or by using a Ni-Cd battery charger, which has a built-in discharge    circuit.
• If you have a Ni-Cd battery that has been repeatedly recharged without being fully discharged and/or a    battery that no longer will take a full charge, you can sometimes reverse the crystal formation by    putting the battery through several complete discharge and recharge cycles. The fastest method for    doing this is to use a Ni-Cd battery charger with a built-in discharge circuit (as above). However, you    can also do this by running the device with the battery installed until it completely dies and then using    standard charger.