This Lenovo laptop is like new, used once and then was not used for three years. Laptop is working fine but the battery is not charging. When i measure with multimeter while charger plugged in, the voltage on battery connector jumps to 15 vol to 0,8 vol, then again 15 vol to 0,8 and so on. Left it over night but same thing. When battery removed it shows 0.00 vol on battery. I was thinking to use lab power supply to try to revive it but i must say that i have a little experience with fixing batteries and that i never tried to charge this long dead battery that shows 0.00 vol. I thought i once read that if lion battery goes below some voltage that it is not even safe to force charge it with power supply. Any advice how to proceed or its just better to buy a new battery?
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You will have to buy a new battery. It is too risky to hot wire other ideas to resurrect this deeply discharged battery. With regret we have had the same issue with some of the spare batteries we purchased for our hand screwdrivers from Milwaukee tools. Batteries just need to be kept charged up over time. Beyond the chemistry change of the cells, the BMS board in this battery pack has probably locked you out already to further prevent any harm to the user. Summary, one wrong move and you will have a fire hazard or worse.
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