[time-nuts] HP3588A battery

[Matthew Martin]

It looks like I need to replace the battery in my HP3588A spectrum analyzer. The service manual says the HP part number is 1420-0336.

Before I pull this monster off the shelf and open it up, I would like to obtain a replacement battery & be ready to swap out the old battery for a new one. 

Anyone out there know what might be a decent replacement battery?  I suspect it is a lithium battery in the 3.5 volt range, but I don’t know. 

Any help is much appreciated!

Matt
N6LQB