I have some older 12V ni-cad battery packs for one of my cordless drills. It's been discharged for or a spell since I don't use it often these days. Tomorrow, I have a project and I plugged them into the charger. When the charger is on, they both began emitting a high pitched whistle. Not wanting the battery to vent or such, I removed them.
Are these battery safe or are they gone?
Edit: could something in the charger whistle if the resistance on the batteries is high and/or not allowing the charger to charge them?
Are these battery safe or are they gone?
Edit: could something in the charger whistle if the resistance on the batteries is high and/or not allowing the charger to charge them?
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