Safely charging my 65

[PANAMATIK]

(03-21-2015 02:32 AM)Brad Barton Wrote:  Having possibly fried the ACT chip in one of my HP-97 ....

I cannot give advice for charging more than others have given you already. I agree that you can safely charge the batteries inside any woodstock calculator if the calculator is switched off.

But you can repair your fried HP-97! Although the new ACT is not suitable directly for the HP67/HP-97 it can be used to replace an HP21/HP-25 and use the original ACT in the HP-97s. All you have to do is buying a working HP-25/HP-25C and replacing its ACT.

I tried an HP-25C ACT in my HP-97 and everything including printer is working fine. Unfortunately the card reader of my HP-97 was not yet repaired, so I couldn't test it, but I assume that it should also do well with any ACT.

If replacing the HP-97 ACT you should know, that even with a low profile socket there is not enough space inside the case, it must be soldered directly.

Bernhard