Texas Instruments 3000 - Manual (Page 113)

Care and Handling of the Battery
q
When using the computer for the first time, or after prolonged storage in
temperatures above 95 degrees F (35 degrees C), a battery charge may
not last as long as normal. This condition disappears after a few full
discharge/recharge cycles. See 'Conditioning the Battery' in Chapter 3
for details.
q After charging the battery, wait about 10 minutes to allow the battery
pack to cool down to operating temperature before attempting to operate
the computer on battery power. Otherwise, the computer could possibly
turn off and on.
Note: The battery is fully charged when the AC Adapter's amber light goes off and its
green light comes on and remains on for at least 1 1/2 hour.
7-6 Taking Care of Your Computer