Please can anybody advise what battery lifetime I can typically expect from an HP-42S and an HP-27S? We bought two 'mint' HP-42S and HP-27S calculators via eBay earlier this year but the batteries seem to go dead after only about 1 month of light use.
Reason for asking is we also use an HP-14B and HP-32S for our nuclear consulting work, and the batteries seem to be going strong even after 12 months of daily usage.
Do the HP-42S and HP-27S calculators have much higher battery drain than the HP-14B and HP-32S or are the calculators probably going wonky? NB we are using 3 new Duracell 357/303 (SR44W) silver oxide button cells in each calculator.
Best wishes
Ian J
www.JacksonConsult.com