Inserting batteries on original Voyagers HP calculators

To replace the three battery cells on Voyager HP calculators while minimizing the risk of memory loss the job should done as fast a possible.


To be fast it must be easy too.
On original Voyagers there is a #1 marked in one of the batteries in the information label.

This is the procedure to use on a 1982 Voyager:

While holding the machine on your hand at a 45 degrees inclination and having the battery compartment in the upper position:

Drop the first battery cell in lowest position (#1):
 

Drop the second battery cell in the middle position:

Drop the the third and last battery cell on top.
Job done.

 If you are not able to insert the third battery, check the batteries polarity orientation.
The negative side  (smaller area) must be facing down.
In this example I tried to insert the three cells with the wrong orientation. They don't fit: