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I opened the Duo power supply by force because the capacitor burned a hole in the case. PowerBook 1xx power supplies have already been (carefully) squeezed with a vice and successfully opened.

You can remove the battery after you opened the 4 screws on the bottom and the smaller screw on the backside near the modem port or cover of the modem port slot.  When you move the upper and lower part of the PB a bit there is enough place to remove the battery.

True. :)

True.  And a CF card helps RamDoubler to make the PB 150 fast, when more Ram is missing. 

I did it again, with my second PowerBook 150: I formatted (again) a Maxflash 2GB CF card in the PCMCIA Slot of my PowerBook 2400c in Mac OS 8.1 (again) with it's Drive Setup (seems to be low level format as it lasts more than 30 mins). Made 3 partions, copied the contents of the PB 150 Disk...

third same post!  problem on iphone...

sorry double post

See this thread too: https://68kmla.org/forums/topic/48434-datetime-jumping-around-on-powerbook-160165/?tab=comments#comment-509222

Same here with a PB 180c.  Apple Diagnostics app found a Logic Board problem so I replaced the complete lower part of the PowerBook, but with same results. Everything else is working fine. My second  PB 180c doesn't show this problem.  I solved this problem some years ago by replacing the...

PowerBook 500 Series: Measuring AC Adapter Output: https://support.apple.com/kb/TA32851?locale=en_US&viewlocale=en_US

I posted this picture 5 years ago here too: I found the original picture 12 years ago here: Your "missing female connector metal in position 4" is found 12 years ago also here:

I measured them all in the past as I told you before.  So believe it or not, I continue watching CNN now...

I don't measure it now. I have more important things to do now. I did it in the past to find out if there are more than one  PB 5x0 power supplies with no power on vbatt+ BTW: I did not invent the expression "vbatt+". I found it on a picture of this power supply in Internet some years ago. 

I was in my cellar now: I have 6 PowerBooks 5x0. They all have this missing pin as you call it. On your picture it looks like that there is no metal in the missing pin.  All of mine show metal in it. 

I own a PB 5xx power supply which supports the PowerBook but doesn't load batteries because vbatt is zero. 

here are the pin outs, it's seems there are different models...

True.  I even changed the interconnect board.  :-( But I also changed the cover with the broken hinge mounts.  So this PowerBook looks like new now.  ;)

I finally found the solution!   In RamDoubler 2 readme file:   "68030-based PowerBook and Duo users with 8 MB RAM in System 7.5, may experience the following if in 24 bit mode: a. the PowerBook won't go to sleep when you shut the lid b. the physical buttons for the monitor backlight don't...

It's not so easy as I thought. I thought I'll solve this problem by de-activating several extensions and deleting several prefs in the prefs folder. No luck.  Only Disk Copy 4.2 when started is able to eject a non Finder recognized disk. And of course disks are still recognized by Finder when...

omg!  It must be a software thing!  When I start with extensions OFF, floppy disks are recognized as usual by Finder ! I unscrewed the PB so often.....