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T520 battery mystery

T400/T410/T420 and T500/T510/T520 Series
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bonjonno
Posts: 35
Joined: Tue Apr 14, 2009 10:15 pm
Location: Rapid City, SD

T520 battery mystery

#1 Post by bonjonno » Wed May 18, 2022 10:50 am

I replaced my T520 system board and everything works except the battery. Curiously, it registers as being connected and will accept a charge. But as soon as I remove the AC adapter the system is dead. I have tried 3 different batteries of varying health that all work in different units. I can only assume there is a fault somewhere on the board. Any suggestions? I've tried all the standard fixes like full reset to no avail. Thanks.
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dr_st
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Posts: 10032
Joined: Sat Oct 29, 2005 6:20 am
Location: Israel

Re: T520 battery mystery

#2 Post by dr_st » Wed May 18, 2022 12:45 pm

So the battery can be charged in the laptop, but the laptop won't run off the battery?

After you disconnect AC and it dies, can you turn it on while on battery?
Thinkpad 25 (20K7), T16 Gen 3 (21MQ), 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
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bonjonno
Posts: 35
Joined: Tue Apr 14, 2009 10:15 pm
Location: Rapid City, SD

Re: T520 battery mystery

#3 Post by bonjonno » Wed May 18, 2022 1:02 pm

No. It's as if there is no power source.
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