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Hi Bob,

There is no controversy, just some back and forth.

I am never sure what sets Tam off.? I am generally
sure his utterances rarely meet decency standards for
polite company... Whatever that means.

If the cell is rechargeable, then they must think the
circuit being backed up has too heavy of a current draw
for a normal primary cell to handle.

And, rechargeable lithium cells don't hold their charge
for nearly as long as do the primary cell kind.? So, it
may be needed capacity due to the cell's expected self
discharge rate.

-Chuck Harris



Bob Albert via Groups.Io wrote:
>? I didn't mean to start a controversy.? The energy in a cell is measured in terms of its Ampere-hour rating in conjunction with its voltage.
> Why HP chose such a large battery is beyond me.? Nobody has come forth with the information regarding the charging of this cell in the 54542A.? (My apologies for perpetuating the incorrect term 'battery' for a unit with a single cell.)
> If it is used as a keep-alive memory voltage, it needs to supply no current and thus doesn't need recharging unless its self discharge is significant.? And more than 2 Ampere-hours is major overkill.? A little CR2032 ought to be sufficient.
> I wish a schematic diagram were available.? I will learn more when I get around to opening the oscilloscope.? But since it's working well, I hesitate to muck around with it, especially in view of the many other projects I have in the works.
> Finding an exact replacement is not easy.? I have found some at somewhat lesser capacity but they aren't cheap either, and don't have solder tabs.? I know soldering to these cells isn't recommended but I have done it successfully.? I do have some stock of CR2032 cells and a couple of holders for them so that could be a way to go.? These are not rechargeable.
> If someone would please step in and clear the air here I would much appreciate it.
> Bob