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  • DaMonkey commented on msuzuki777's instructable Rechargeable Battery Tips8 months ago
    Rechargeable Battery Tips

    Disclaimer: I am not an expert, professional, or otherwise qualified individual. I am sharing my own experience. You assume any and all risks from performing the processes outlined below.I've been playing with/resurrecting dead NiCads for a few months now. This is what I've learned.Find a voltage source about twice the voltage of the battery you want to restore. I use 20v Li-Ion batteries, connected in series of I need more power. Some have used battery chargers and/or arc welder leads, but I haven't tried them as this works for me.Connect a lead/wire from the negative of the power source to the negative of the battery you want to restore. Connect one lead/wire to the positive of battery and another to the positive of the power source. Ideally, these two leads should end in alligator...

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    Disclaimer: I am not an expert, professional, or otherwise qualified individual. I am sharing my own experience. You assume any and all risks from performing the processes outlined below.I've been playing with/resurrecting dead NiCads for a few months now. This is what I've learned.Find a voltage source about twice the voltage of the battery you want to restore. I use 20v Li-Ion batteries, connected in series of I need more power. Some have used battery chargers and/or arc welder leads, but I haven't tried them as this works for me.Connect a lead/wire from the negative of the power source to the negative of the battery you want to restore. Connect one lead/wire to the positive of battery and another to the positive of the power source. Ideally, these two leads should end in alligator clips to hold a piece of steel such as a nail or washer. Bare copper is soft and can get welded at the contact point causing the batteries to overheat and potentially explode.Take the two positive leads and tap them together rapidly about ten times. Slit, close, or avert your eyes as you do this as the spark may be very bright. Rest about a minute, then repeat. Charge the battery fully, then discharge completely using the intended device. Charge again, then use as normal. Using this method I have restored at least a dozen tool batteries for myself and others.Do not freeze NiCad battery packs! It has been recommended in some places that freezing will aid battery recovery. Voltage measurements I have taken from fully charged resurrected batteries are lower if the battery has been frozen. Some will no longer charge to full voltage, even though they did so before freezing and thawing. In at least one case, the battery now registers as defective on the charger. I have replicated these results several times, now.

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