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I see that the two batteries demonstrated were from different manufacturers. I've heard this claim before, but is the difference so pronounced when using batter

I see that the two batteries demonstrated were from different manufacturers. I've heard this claim before, but is the difference so pronounced when using batteries from the same manufacturer? Also, the dead battery is at 0.6 volts - I've never seen a battery that dead. Is the bounce effect so pronounced when a battery is at 1.1 volts, which is a far more typical dead battery voltage?

kalleboo 3y ago
EEVBlog did the same test with matching brands and discharged to 1.2 V unloaded/0.8V loaded https://www.youtube.com/watch?v=PRf9JTg3QwA https://www.youtube.com/watch?v=PRf9JTg3QwA
- martin-adams 3y ago
  An even better test would be to test the same battery before discharge and after.
  - teekert 3y ago
    Yeah that’s basic science.
    - bmacho 3y ago
      No that would be far far worse test than having 2 equivalent batteries, and discharging one of them. First, it is easier to measure differences than absolute values (by eye, but even with precise equipment), second it automatically cancels out the affects of temperature, humidity, pressure etc. (Okay, you know that these things doesn't matter in this experiment, still.)
  - gwd 3y ago
    Or perhaps, buy six identical batteries, labeled 1-6; randomly charge them to two different levels (100% and 60%), three each, noting down which was which; then hand them to another set of people, who have only seen the numbers, and bounce each of them, to see how reliably they can tell the difference.
    - londons_explore 3y ago
      Only works with alkaline non-rechargeable batteries, but apart from that, yeah.
      - dotancohen 3y ago
        Which is arguably the most common type of AA sold.
    - zoky 3y ago
      Or even better, buy six million identical batteries, label them, discharge them randomly, run some rudimentary tests, and announce you’ve identified a room-temperature superconductor! …Too soon?
rob74 3y ago
Well, it should be relatively easy to try to reproduce the experiment... but yes, I agree that a battery will be considered "dead" when the device it was powering stops working with the provided voltage, and 0.6 volts is likely far below that voltage (except maybe for traditional flashlights with incandescent bulbs which get dimmer and dimmer, but will probably still work?).
bentcorner 3y ago
I use this all the time with the bulk batteries from Costco. My gut also says the bounce effect is a little too sensitive, as I've had batteries have a good bounce even when the device they're is still able to pull some juice out. But a fresh battery will 100% not bounce. It's the simplest thing to do when you're changing the batteries in something and you got the old/new batteries mixed up.

kalleboo 3y ago

EEVBlog did the same test with matching brands and discharged to 1.2 V unloaded/0.8V loaded https://www.youtube.com/watch?v=PRf9JTg3QwA https://www.youtube.com/watch?v=PRf9JTg3QwA

martin-adams 3y ago
An even better test would be to test the same battery before discharge and after.
- teekert 3y ago
  Yeah that’s basic science.
  - bmacho 3y ago
    No that would be far far worse test than having 2 equivalent batteries, and discharging one of them. First, it is easier to measure differences than absolute values (by eye, but even with precise equipment), second it automatically cancels out the affects of temperature, humidity, pressure etc. (Okay, you know that these things doesn't matter in this experiment, still.)
- gwd 3y ago
  Or perhaps, buy six identical batteries, labeled 1-6; randomly charge them to two different levels (100% and 60%), three each, noting down which was which; then hand them to another set of people, who have only seen the numbers, and bounce each of them, to see how reliably they can tell the difference.
  - londons_explore 3y ago
    Only works with alkaline non-rechargeable batteries, but apart from that, yeah.
    - dotancohen 3y ago
      Which is arguably the most common type of AA sold.
  - zoky 3y ago
    Or even better, buy six million identical batteries, label them, discharge them randomly, run some rudimentary tests, and announce you’ve identified a room-temperature superconductor! …Too soon?

rob74 3y ago

Well, it should be relatively easy to try to reproduce the experiment... but yes, I agree that a battery will be considered "dead" when the device it was powering stops working with the provided voltage, and 0.6 volts is likely far below that voltage (except maybe for traditional flashlights with incandescent bulbs which get dimmer and dimmer, but will probably still work?).

bentcorner 3y ago

I use this all the time with the bulk batteries from Costco. My gut also says the bounce effect is a little too sensitive, as I've had batteries have a good bounce even when the device they're is still able to pull some juice out. But a fresh battery will 100% not bounce. It's the simplest thing to do when you're changing the batteries in something and you got the old/new batteries mixed up.