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Thinkpad Battery "Whitelist" ... how does it work?

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Scorpion8
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Thinkpad Battery "Whitelist" ... how does it work?

#1 Post by Scorpion8 » Mon Apr 27, 2020 9:09 pm

Been wondering this since I got my T430s, but how does the non-Lenovo battery whitelist work? I have always been amazed that Apple can make it so their phones will detect non-Apple "pure" charging cords and other accessories, but how? How does the machine know that a battery is NOT a Lenovo-pure battery, and why can't that be spoofed? I see many, many non-Lenovo branded after-market 81+ batteries for my T430s, at much reduced cost compared to the Lenovo-branded fodder. So why can't these be made to work without the BIOS hack?

Is it one of the connectors on the connecting pin perhaps?
2@ X120e's for fun, T430s/X220i/T420 running Win10.
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theterminator93
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Re: Thinkpad Battery "Whitelist" ... how does it work?

#2 Post by theterminator93 » Tue Apr 28, 2020 12:29 pm

I don't have much technical expertise to contribute, but I do know that this is related to the EDID chip on the battery. It's software embedded on the battery control chip - probably some kind of challenge/response from the system BIOS to authenticate the battery. Possibly similar to how OEM Windows activations work?
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dr_st
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Re: Thinkpad Battery "Whitelist" ... how does it work?

#3 Post by dr_st » Tue Apr 28, 2020 2:05 pm

Scorpion8 wrote:
Mon Apr 27, 2020 9:09 pm
I see many, many non-Lenovo branded after-market 81+ batteries for my T430s, at much reduced cost compared to the Lenovo-branded fodder. So why can't these be made to work without the BIOS hack?
Some of them work without the BIOS hack. I had such a battery myself (an obvious counterfeit). It worked and the laptop did not complain (I still sent it back because I don't like supporting scammers selling fake stuff as genuine; if it had been sold as "compatible", I wouldn't have a problem).
Thinkpad 25 (20K7), T490 (20N3), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU

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