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  • DonL55 commented on studleylee's instructable Reviving an AutoDarkening Welding Helmet1 month ago
    Reviving an AutoDarkening Welding Helmet

    Here's an update to my(DonL55) hack. There is only one Panasonic battery to replace. The Tenergy 3v RCR123a battery I used, is a lithium ion battery that can charge to 4.2v and has circuitry, which activates at initial load, that limits voltage to 3v. If charged to 4.2v(battery circuit limited) the batteries internal circuitry to adjust to 3v is quick, but not quick enough to not damage some circuits so be careful if your battery comes charged to 4.2v. My battery came charged and I discharged it to 3.2v so you wouldn't need to buy the charger for this. This type of battery needs to charge at .2C which for this 600mAh battery is 120mA...so a special charger is needed for charging. I placed a work led lamp which is super bright about 1ft away and left it there for 2hrs and then checked t...see more »Here's an update to my(DonL55) hack. There is only one Panasonic battery to replace. The Tenergy 3v RCR123a battery I used, is a lithium ion battery that can charge to 4.2v and has circuitry, which activates at initial load, that limits voltage to 3v. If charged to 4.2v(battery circuit limited) the batteries internal circuitry to adjust to 3v is quick, but not quick enough to not damage some circuits so be careful if your battery comes charged to 4.2v. My battery came charged and I discharged it to 3.2v so you wouldn't need to buy the charger for this. This type of battery needs to charge at .2C which for this 600mAh battery is 120mA...so a special charger is needed for charging. I placed a work led lamp which is super bright about 1ft away and left it there for 2hrs and then checked the voltage on the battery and it just barely increased the voltage, so I doubt the 4.2v limit will ever be reached while using...Oh, did I mention it works great so far and I'll try and report back 1yr from now with another update.

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