HP -01 Owner's Manual page 77

your dealer. Do not return the unit to an HP Customer Service Facility; if the HP-01 is returned
for battery replacement, you will be charged a nominal fee regardless of whether or not your
warranty is in effect.
CAUTION
Do not use hearing aid batteries. Use only Eveready or UCAR (Union Carbide) 357
batteries or equivalent. Also, do not attempt to recharge your HP-01 batteries.
Changing the two display batteries does not alter or destroy any information stored in your
HP-01. The time setting, date setting, and any number stored in M are all still current and
operable.
However, when you replace the circuit battery, none of the time, alarm, date, or memory data
is retained. Set the functions that you need immediately after the circuit battery is changed.
Maintenance and Service 75