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Experiences with TI BQ management IC’s when re-building laptop batteries ?

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GlennSprigg:
'Safety' my 'ass!!!'...  I smell a rat, as big as an Aussie Wombat!!!
Bloody ruse, to take away home servicing possibilities.

amyk:
https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/bqEVSWSetup00.09.92_5F00_bq30z55v0.36R3c.exe

(Found while searching the TI site - download and archive quickly, I suspect they may not be too keen on these being shared.)

torture:
Thank you, i downloaded and installed it. I was seraching the TI website and forums for a long time but i missed this one. Unfortunately the chip that i have is some different version that is not supported by this version of BQEVSW. So i still have to find the right one. Does anyone know what exactly is the version of this chip so i can search for the version of BQEVSW that works with it.

peterburk:
Have any of you had any success unsealing a TI BQ20Z451 gas gauge chip?

In September 2020, my 2014 MacBook Pro 15" Retina A1398 battery cells started swelling. The computer's long out of AppleCare, so getting an original part isn't an option.
I bought a third-party replacement battery, but that broke the logic board.
The fake battery has an idle voltage of 12V, compared to the original which idles at 2V and "wakes up" to 12V. This is important because there can be voltage spikes during power state changes.
I tried replacing the cells, but in the process I disconnected power, and now the PF flag is set due to an undervoltage error.

Charlie Miller's research was helpful, but his hack only works on the BQ20Z80, an older model.

https://docplayer.net/19923167-Battery-firmware-hacking-inside-the-innards-of-a-smart-battery-charlie-miller-accuvant-labs-charlie-miller-com-twitter-0xcharlie.html
I'm using Charlie's code to write a fuzzer for an unseal code of 8 hex digits, but I guess this won't work if the code is in fact 160 bits SHA-1.

Be2Works can't unlock TI BQ20Z45x firmwares newer than v5 (mine is 702).
http://be2works.com/

Can any of you help me figure out what to try next? Any advice would be helpful! I'm willing to try voltage glitching, but wouldn't that just trigger the PFF again?

And if any of you know how I can get batteries shipped to New Zealand, I could also buy that. iFixit and OWC won't even send batteries to here (though rumour has it that their batteries are the same as the one that broke mine).
https://www.ifixit.com/Answers/View/670587/A1398+-+New+Simplo+battery+-+System+dead+after+3+days.


Fraser:
Apple offered a battery replacement battery deal on my iPad Air2 at a cost of £80 and they gave me a brand new iPad Air2. For me, that was a good deal. Have you asked your local Apple service centre what they charge fir battery replacement on your MAC ? I see that in the UK the price appears to be £129 or £199 depending upon model of MAC PRO. It may be worth investigating ? A decent quality replacement battery could easily cost £80 so £129, including labour, did not sound too bad to me.

Apple appear to be aware of the bad publicity that battery failure in Apple products has attracted in the past and seem to have offered reasonable solutions at reasonable cost for such failures.

https://support.apple.com/en-gb/mac/repair/service

Fraser

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