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X20 Console Manual
Disadvantages of Nickel-Metal Hydride
Batteries
• Limited service life - the performance starts to deteriorate after
200-300 cycles if repeatedly deeply cycled. Deep cycling does not
occur in normal X20 use
• Relatively short storage of three years
• Limited discharge current - although nickel-metal-hydride is
capable of delivering high discharge currents, heavy load reduces
the battery's cycle life. High discharge only occurs during an
emergency battery-supported shutdown of the X20
• More complex charge algorithm needed - nickel-metal-hydride
generates more heat during charge and requires slightly longer
charge times than nickel-cadmium. Trickle charge settings
are critical because the battery cannot absorb overcharge.
This is managed by the X20's microprocessor controlled power
management system
• High self-discharge - typically 50% higher than nickel-cadmium
• Performance degrades if stored at elevated temperatures-
nickel-metal-hydride should be stored in a cool place at 40%
state-of-charge
• High maintenance - nickel-metal hydride requires regular full
discharge to prevent crystalline formation; nickel-metal-hydride
once in every 3 months. This will happen between seasons but
probably not as often as required for absolute maximum life span
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Cool temperature and partial charge slows battery aging
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