Texas Instruments 4000M - Manual (Page 45)

Guidelines for Battery Use
Caution: Never dispose of exhausted batteries in a fire.
The battery should be handled carefully to ensure maximum life. In particular:
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Do not drop the battery or subject it to shocks.
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Do not expose the battery to direct sunlight, moisture, chemicals, or
temperature extremes.
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Do not short the battery leads or connect the battery with the wrong
polarity.
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Charge the battery after several days of disuse to keep it fully charged.
If your computer is idle for an extended period of time, charge the
battery every three months.
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Never use the battery to power other products.
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The battery pack has thermal fuses to prevent unsafe computer
operation. The computer may not operate on battery power after
storage in a very warm place until the thermal fuses cool.
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The battery and its case are built as one unit; do not try to open the
battery case.
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