Thanks for the posts! I just picked up one of the 3562A DSAs and it had that message as well. Sounds like an easy fix. FWIW, a clip from the schematic shows it should be 3.9V, so anything lower just wouldn't last as long ... I found some batteries 3.9V 2Ah for $50, so I might do something different too, lol. Update: I ordered the Tadiran Karl suggested. TL5104P for $10 shipped BatteryDepot via Amazon.
very cool. that should work great. let us know how you progress
I calculated the lifespan of the 3.6v 2400mah battery i used to be around 10 years.
i wish i had not been in a rush myself as i would have gone for the uber high quality Saft LS1500-AX or the Tadiran TL5104P which is also excellent battery.
the XENO battery i used is a XL-060FAX - its a no-name brand my book, but it does work.
just an fyi, i thought the same thing, that the 3.9v batter would give me extra life, but not so..i dug into the discharge curves before i got my battery, it tuns out the 3.9v Thionyl Chloride drop down to the same nominal voltage as the 3.6v and 3.4v batteries after they discharge 10-20% so the lifespan is identical.
the 3.9v lithium Thionyl Chloride batteries ar actualy Thionyl Chloride with bromine chloride which gives them a higher initial voltage but after 10-20% acts the same.
oh, also those 3.4v batteries seem to start at 3.6v and drop to 3.5 over most of ther lifetime at light loads .. so .. they seemed to be spec'd at ther rated voltage at higher loads, but the discharge curves seem the same to me.
add in the fact the dropoff curve at end of life is extremely sharp and bottom line for us, the 3.4-3.9v lithium Thionyl Chloride batteries provide the same longevity for any given mah rating.
so might as well stick with the somewhat standard 3.6V ones.
I also dug into the schematic and memory specs also to see if there were any concerns.. bottom line any of the AA 3.4-3.9v lithium Thionyl chloride batteries are fine and not near or over to the maximum voltage nor do they go below the needed voltage until they have reached there end of life capacity.