Appendix D: Operating Characteristics
5. Insert the new battery pack so that its contacts face the calculator and contact is made with the battery connectors.
6. Insert the top of the battery door behind the retaining groove and close the door.
7. Close the battery door by pressing it gently while sliding the two battery-door latches upward.
NOTE: If you use your HP-80 extensively in field work or during travel, you may want to order the Model 82004A Battery Holder and Pack, consisting of battery charging attachment and spare battery pack. This enables you to charge one pack while using the other.
Do not try to burn old batteries. They may EXPLODE!