I want to get some advise from you before I dive into this further.
So I have purchased half a dozen brand new genuine Lenovo T410/T420 batteries recently, they came in genuine Lenovo box with the seal intact. The date on them is 2011.08 so they are nearly 9 years old and I guess they have not been charged since.
So I have installed one of them in my T420 after it booted into windows, opened the power managed and the first message I got was that battery is in good condition, with 0% charge. Looking at the voltage it was showing 0.01v. After around 10 second the messaged has changed to battery cannot be detected with the cross appearing on the power managers icon on the task bar.
I checked another 3 batteries and they have all done the same thing.
Now I understand whats going on, the controller in the battery is disabling the battery as the voltage has dropped the below set threshold however I'm wondering if anyone has every tried re-enabling the controller so the battery can accept charge again.
What Im thinking is I want to try, before connecting the battery to the laptop and getting them to be disabled again I want to try to drill two small holes in the battery cases in either side (I know exactly where to drill as I have an old battery which I have opened) without damaging the cells inside, and connecting an external charger which should bring the battery voltage to operational 11-12v, thus bring the voltage above the threshold which I believe is set to around 7v.
Wondering if anyone has done this.
Would be a waste not be able to use this genuine batteries in all the thinkpads I have here.
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that is sure a novel approach to recovering a NOS battery..
IF you give that a try i would sure use a charger for Li batteries BUT i'm not so sure it would work since those external chargers (see amazon) used for charging Li battery cells expect to see a controller.. i've been warned that Li batteries can explode or catch fire or otherwise melt down if charged without a charge controller..
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