IBM L40 SX Quick Reference page 36

PS/2 Model L40 SX Quick Reference
When Not Using the Rechargeable Battery for a Long Period
|3.1.1.4 When Not Using the Rechargeable Battery for a Long Period
|If you do not use the Rechargeable Battery for a long period, remove it
|from the computer and keep it in a cool place. The Rechargeable Battery
|should be charged at least once every 6 months to extend the battery life.
¦ Copyright IBM Corp. 1991
3.1.1.4 - 1