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PowerBook 500 Series Battery Rebuild Failure (Oops, all dead EMMs!)

jmacz

Well-known member
Nice that you got one working!! That explains the no power to the EMM.

I think you mentioned that the other board also had no power on pin 13? Sounds like a similar issue where the battery power isn't getting to the chip?
 

3lectr1cPPC

Well-known member
The battery that works is also cutting out randomly, which I’d suspect to be an issue with the ribbon connection? Didn’t you have something similar? This is the one with corrosion, so I may have to bypass the ribbon connection to battery positive.
 

jmacz

Well-known member
The battery that works is also cutting out randomly, which I’d suspect to be an issue with the ribbon connection? Didn’t you have something similar? This is the one with corrosion, so I may have to bypass the ribbon connection to battery positive.

What do you mean by cutting out? The battery detects/doesn't detect in the laptop or charging starts/stops?

I had an issue where the battery kept detecting/not detecting in the laptop and that turned out to be the memory chip which I replaced. In my limited experience with these batteries, if either EMMpathy or Lind are able to correct all errors in the battery and on a subsequent check it detects no errors, the memory is probably good. You only have a potential memory issue if neither tool is able to correct it no matter how many times you try.

I also had an issue where the battery kept trying to charge but kept stopping every 30 seconds or so. That turned out to be the charger (where I had a faulty 16V 2A supply). Replacing the charging half fixed that issue.

The battery I couldn't get working at all was the one with the "short" in it .. power was getting to the chip but it wasn't behaving right. I think that chip is dead but I will pull that one out and some point and see if I can debug it further. But it's way down on my back burner since I have two working ones.
 

3lectr1cPPC

Well-known member
EMMpathy smart probe is showing a rapid voltage drop from the cells down to about 8V until it dies. Also says it’s at 100% so it won’t try to charge.
 

3lectr1cPPC

Well-known member
IMG_6553.jpeg
That’s not good. Says shorted cell when I plug it in.
I did briefly short of the pack for less than a second when I was assembling this pack, I wonder if I fried it. I may try swapping in the other cell pack.
 

3lectr1cPPC

Well-known member
Swapped the other cells in and they’re low on charge, aaaaand, they won’t charge with my supply with just the VBATT line. So now I need to figure that out. Will probably get that second supply and wire it up.
 

3lectr1cPPC

Well-known member
Absolutely! I think this one battery should work out once I've gotten a proper charging solution made. Thanks a lot for your help all throughout this process.
 

alexGS

Well-known member
I’m sorry I haven’t been any help - thank you for tagging me, jmacz - I’ve started the year away on holiday for a month.

I have four EMM boards that don’t respond (EMMPathy waits for the EMM to come online and it doesn’t) - so I have a way to go yet, but I do have one working battery which charges off the original power supply. I do think VBATT must be limited to about an amp, for the battery to be charged properly
 
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