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Different types of batteries have different requirements for care and maintenance. In order to ensure maximum battery usability, you should carefully follow the recommendations for each battery type.
Nickel-cadmium batteries are generally the most robust of all the battery types. They're the oldest and most reliable battery type, (often over 200 charge/discharge cycles) and are fairly resistant to overcharging, vibration, and other forms of abuse.
NiCad batteries can be charged at a maximum rate of 2C.
NiCad batteries should be left discharged at the end of the flying day. When stored long-term (over two months) they should be stored in a cool storage area. After storage, you should do a formatting charge (which overcharges the pack slightly) to ensure the battery pack is properly balanced.
NiCad batteries contain cadmium which is toxic and can cause lung and kidney damage. Be sure to wash your hands after handling nicad batteries. Also, nicad batteries MUST be disposed of properly. See the end section about battery disposal.