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Thread: How do you check the voltage on an Ego battery?

  1. #11
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    I cut open an old carto put it on the battery and use alligator clips to connect my leads press the button and you have it.

  2. #12
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    Quote Originally Posted by njay23 View Post
    Deleted... thought you meant an ego twist not a regular ego
    Actually, although I said Ego battery, what I have is an Ego Twist.
    The advice I got in the first reply worked just fine though.

    Or at least I think it did.

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    I have an idea (a phrase that has always caused co-workers to cringe in terror). If you were to take one of the little plastic plugs out of the end of a carto, stick one probe through the hole in that, and use that one for the center post on the eGo, wouldn't that provide enough insulation barrier to avoid the dreaded "BOOM"? Just stick that end in and use the other probe on the outside ring and it should work. My hands tend to shake at odd moments so I'm not about to risk a battery by using to bare probe ends on a live battery.


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    Quote Originally Posted by DC2 View Post
    Ah, pressing the button, that's what I was missing!

    So yeah, it is a bit tricky to say the least.
    Would be much easier if I could grow a third hand.
    Or make one of these using an old atty/carto


    (it will even read the voltage if you reverse the polarity)
    BWhare and steved5600 like this.
    http://www.casaa.org/images/9974739e5e33027c7244f0b4518d5a2d.jpg

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    Use to be an Electronics tech before I was an Net Eng. Safest way is to take one lead to a Volt meter and put a bit of tape so only the very tip of the probe is exposed then using the probes like chop sticks in one hand put the insulated tip in the hole to the center conductor and holding the other against the outside of the battery. Then use the other hand to push the button. Or get your Vape slave to help. LOL. Check it after charging and then you have a reference point. If you want to go very techi. There is a circuit you can build to check the internal resistance of the battery. When the battery's internal resistance rises that is an indication that the battery is starting to go. You have to know what it was like out of the box to have a reference point. This may be a lot more trouble than it is worth for most. But I'm a tech weenie so i love such stuff.
    If any other DIY's or other nerds are out there here is a diagram of the circuit I'm talking about.
    Commercial/industrial energy efficiency: Electric cell - Internal resistance of battery

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    Almost forgot. Here is a video of what I was talking about.
    How to test the internal resistance of a battery - YouTube

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    Quote Originally Posted by tj99959 View Post
    Or make one of these using an old atty/carto


    (it will even read the voltage if you reverse the polarity)
    How did you connect the center lead?

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    Quote Originally Posted by steved5600 View Post
    How did you connect the center lead?
    Just pulled the guts out of a old atty, then pushed the pos. post out the bottom of the atty. Soldered a wire into the center hole of the post, and pushed it back in.
    steved5600 likes this.
    http://www.casaa.org/images/9974739e5e33027c7244f0b4518d5a2d.jpg

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    To measure voltage on any device using PWM you need a Digital Multimeter that measures True RMS. These are generally not cheep if you serious i suggest getting a quality meter I suggest Fluke meters as that is what i have used for years as a electrician .

    I just tested my ego twist batterys and got a low of 3.23v and a high of 4.94v.

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