I'm wondering if batteries can be recharged after being left uncharged for a long time, like 1-2 years. Specifically, I'm asking about the Galaxy A31 and Lenovo IdeaPad 2018 330S. Do they get permanently disabled, or can they still be reactivated and charged?
3 Answers
Once a battery drops below a certain voltage, a safety circuit kicks in to prevent charging, as trying to charge a lithium battery that's reversed can lead to fire hazards. You might try the plug-unplug method repeatedly to potentially get it back above the threshold, but do this at your own risk. Honestly, replacing the batteries is usually the safer and better option since they probably aren’t in great condition anymore.
Most old batteries can still be charged, but if they've been completely empty for an extended time, it might take a while before they show any signs of accepting a charge. Just leave the charger plugged in for some time! They don’t really ‘deactivate’ in a traditional sense.
Yes, it's technically possible to recharge them, but there's a catch. After such a long time, the batteries might become indistinguishable in terms of health, so your mileage may vary!
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