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Appendix D: Operating Characteristics
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 Temporary
degradation, peculiar to nickel-cadmium batteries, may cause a decrease
in the operating period of the battery pack. Should this happen turn
the HP-80 on for at least five hours to discharge the batteries
completely. Then put it on charge for at least 14 hours. This should
correct the temporary degradation.
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If the battery pack won’t hold a charge, it may be defective. If the
warranty is in effect, return the pack to Hewlett-Packard according to
the instructions on page 74. If the battery pack is out of warranty, use the Accessory Order Card provided with your HP-80, to order a new battery pack. Remember, you can use your HP-80 ac power until the replacement battery pack arrives.
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Battery Pack Replacement
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1.
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Turn the power switch to OFF and disconnect the battery charges.
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2.
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Slide the two battery-door latches (the top feet) toward middle of the calculator.
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3.
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Let the battery door and battery pack fall into the palm of hand.
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4.
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See if the battery connector springs have been inadvertently flattened
inward. If so, bend them out and try the battery again.
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