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

jmacz

Well-known member
Yours doesn’t drop to under 700mAH in capacity though.

Yeah, that is true. EMMpathy is reporting the stock 1752 for them always, never changes.

I will test my AA packs on Battery Amnesia later today... currently running down my new "A" pack.
 

jmacz

Well-known member
Just really confusing how all this stuff works :)

I charged my new "A" pack fully via the PowerBook. EMMpathy showed 100% etc like I mentioned a few posts earlier.

I then launched Battery Amnesia and it reported in it's progress that it was starting at around 49%. Huh? I wonder where it gets that value from but how is it that I charged the battery to what the PB and EMMpathy thought was 100% yet this tool is suggesting it's at 49% unless I am understanding this meter wrong.

What's interesting is that Battery Amnesia has been working on this "A" pack for 50 minutes now, which I guess is good. And the progress meter is at "20% left" right now, voltage reading at 10.15V. So it went from 49% to 20%, and took 50 minutes so far to do that. Let's see how much longer this goes.
 

3lectr1cPPC

Well-known member
Batteryamnesia sees each of the 500 Series two packs as 50% each. If you plug a battery into the left bay, it should jump up to 100% according to it.
 

jmacz

Well-known member
Finally died at 88 minutes with the "A" size pack under Battery Amnesia. I would think that's a reasonable result?
 

jmacz

Well-known member
I charged my "AA" size pack and then let Battery Amnesia drain it. It took 77 minutes to drain. That also looks like a good result.

BUT, as I'm charging it now, EMMpathy is showing a red 1480 for the measured total capacity... ?? Not sure why it's only getting 1480mAH. The pack is a 2100mAH. Could be the pack isn't as good as it's rated but previously, I had been seeing 1752mAH always. Mysterious.
 

jmacz

Well-known member
Ran Lind and of course it complains about errors since I've been using EMMpathy. I had it correct the errors. Lind seems to be writing the 1752mAH to the EMM. I then run EMMpathy and it again shows 1752mAH now. I don't know how those two values (factory default and measured total capacity) are used (if at all) but I'm guessing Lind is writing it. When I get a chance, I'll see if I can patch that to be a different value and then see what happens.
 

jmacz

Well-known member
I ran a few more complete discharge and recharge cycles. Honestly can't tell a difference between the "A" pack and the "AA" pack. Battery Amnesia is taking around 80 minutes to discharge either of them +/- 5-10 minutes (discharged individually, not with both batteries in the PB).

Obviously that's not a large enough sample set, I guess I'll get a better feel over time and more use, but at this point, both size batteries ("A" and "AA") fit although if you're going with a pre-built pack, AA is probably better since those pre-built packs are not optimized for space and thus you have more room with the AAs. If you're going A (which is what the original size was), you probably need to build your own pack using thin tabs and optimizing for space otherwise it won't fit. But as of now I cannot tell the difference between the two packs.

Also, EMMpathy every so often reports a measured total capacity less than 1752mAH.. I had a 1480, and a 1672. Not sure what actually reads/sets that (System or EMMpathy or the EMM). Lind corrects it back to 1752mAH. But I did not notice any change in behavior of the capacity based on this value.
 

Iesca

Well-known member
Seems like it would be really helpful if there were a modern software tool to replace EMMpathy and Lind that was a bit smarter about what it was doing, since those two weren't designed with re-packs in mind!
 

3lectr1cPPC

Well-known member
@jmacz
What temperature does your battery report when it hits the full charge mark while charging? Mine (the one that jumps to 100% at ~770mAH) does that jump at exactly 40 degrees C. I caught the moment it happened today.
 

jmacz

Well-known member
I think mine were both above 50C when it reaches full charge. With the 2A charger, it hit 60C .. but with the 1A charging, it was in the 50Cs.
 
Top