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1.2Nickel-Metal Hydride (NiMH)
More recent technology which operates similar to and provides the same capacity as Nickel Cadmium batteries in a lower weight package.
Advantages
Lighter than comparable Nickel Cadmium batteries.
Less prone to memory than Nickel Cadmium.
Fewer toxic metals - more environmentally friendly.
Disadvantages
Self discharges at approximately 30% per month when stored.
Nickel Metal Hydride will not operate at as low temperatures as Nickel Cadmium.
1.3Nickel Cadmium (NiCd)
This well proven chemistry provides the best performance at extreme temperatures but suffers from memory effect and has the lowest power to weight ratio.
Advantages
High number of charge / discharge cycles.
Good performance at low temperatures.
Easy to recharge after prolonged storage.
Capable of sustained high rate of charge and discharge.
Disadvantages
Memory effect will develop if battery is not fully discharged during each cycle.
Battery does not perform well if it is left sitting in the charger and is only used for brief periods
of time.
Must be recycled since Cadmium is toxic.
1.4Selecting the Right Battery
The selection of the correct battery for a particular application will depend on many factors. A typical procedure for battery selection is shown below:
Identify how many hours of operation are required.
Identify if the product will be operated in an intrinsic safe environment.
Identify the required operating temperature range.
For example, inside all day in an air conditioned office, inside a food freezing plant, work in a coal mine.
Having guaranteed the required performance, select the most appropriate
radio battery combination.
For most effective radio performance use only Motorola branded batteries.
