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Dave Frederickson · (This post was last modified: 03-13-2021 08:01 PM by Dave Frederickson.)

Whether you have a block type battery like the PS-628 or the Cyclon 3-cell pack you will need to transfer some of the connecting hardware to the new battery, so which type battery you have will determine which battery you buy. Here're pics of the two battery types for the Portable PLUS.
https://www.hpmuseum.org/forum/thread-41...l#pid37260

So to answer your question, no, you can't use the Cyclon battery pack. The good news is the Powersonic PS-628 is about half the price of the Cyclon. There is a copper strap and a terminal board with the screw terminal connections for the PP that need to be removed and soldered to the new battery's terminals.

The ROM errors are apparently being caused by the Executive Card Manager ROM's. You can try moving the ROM's to different sockets in the ROM Drawer. Unless you're using that software I'd just remove the ROM's.

Dave