I’ve never rebuilt a pack before, but I’ve tempted fate before so I have a bit of experience and know how downright dangerous charging 0V packs can be, and rebuilding.
A lot of laptop batteries today have a one-way permanent failure flag, with some being more aggressive than others - even if you can safely rebuild it. In some cases, especially systems like the Lat E series and 3/5/7/9000 series, a custom TI chip combined with a sensitive BIOS (AFAIK the removable Lats are picky with the E Series, but not sure about the built-in series) also get in the way. That was not a problem on Lat D machines.
Why the change? Shoot for Sony producing faulty cells, which led to a multiyear battery recall which went on from 2005-2008. Before those years, we used to be able to abuse batteries without a permanent failure flag that’s easily triggered; it was there, but you had to be incredibly bold to trip it. You could even swap cells without killing the BMS. On a lot of the older batteries, I’m still able to charge an unused pack from 0V even if it’s been sitting for years (Yes, this is a somewhat dangerous game to play. I DO MONITOR THESE!) and has been the case for over 10 years. The way I see it is if the pack is probably bad, why not try? The manufacturers removed that endurance with cheaper cells and trigger happy BMS boards which trip a permanent failure way more easily then they used to. In addition, a lot of post Sony packs block charging below 3.5-3.7V. You can still tell the thing you mean it, but you need to trick the computer OR use an external charger that tells it where to shove the complaint. The closest we have to that time is Samsung SDI, which can take a similar beating as the Sony cells (but cannot charge a 0V pack, thanks to the modern BMS issues). If it can be done, I’ve found a way.
Sadly, you may need to give in and buy a new pack. The days of taking an old pack from something like a pre-2005 HP and early PB G4 packs where there were no nannies are over, and so are packs that last 10+ years and still work even if they sit thanks to Sony.
Cette réponse est-elle utile ?
A voté
Annuler
Indice
2
Annuler
Faites défiler ce fil pour trouver l'endroit approprié pour y placer ce commentaire. Cliquez ensuite sur « Ajouter commentaire à cette contribution » pour le déplacer.
2 commentaires
Let’s get a better view of things, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Ajout d'images à une question existante
par Dan
@danj Question updated with a CoconutBattery snapshot.
par Alreiber