Warning about using Duracell PROCELL Batteries

Discussion in 'Rocketry Electronics and Software' started by GaryT, Sep 13, 2019.

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  1. Sep 13, 2019 #1

    GaryT

    GaryT

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    Warning about using Duracell PROCELL batteries in your altimeter:

    I came across a post on FB where people were saying their drogue, main or both weren't firing while using the Duracell PROCELL battery. I had the same trouble while running redundant RRC2 Mini's and using J-TEK E-matches. So I ran 10 tests with E-Matches, what I determined was although the battery was new and at 9.4v it wasn't delivering a strong enough current FAST enough to ignite the E-Match. The RRC2 gives power to the match for a full second but these batteries just can't keep up, once I ran the output diagnostic test on the RRC2 and HELD the Enter button down the E-Match ignited proving it took longer than 1 second to deliver enough power to ignite the match. Once I swapped out the battery with a new Panasonic Alkaline Power Plus battery I ran the manual test again 3 times, however this time when I hit the Enter button in diagnostic mode I hit it as fast as I possibly could and each time the E-Match went off instantaneously! Originally I thought the Duracell PROCELL were supposed to be a quality battery? but after further investigation I was told that these were actually generic Duracell batteries. No these test are not definitive but there enough to make me swap out all my Duracell PROCELL batters.

    Disclaimer: This wasn't a very scientific test, I by no means am telling anyone what to use, use what you will. These were my findings and is only an informational post.
     
    Last edited: Sep 13, 2019
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  2. Sep 13, 2019 #2

    Steve Shannon

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    Did you happen to measure the current during that time? Anything over half an amp should quickly ignite almost any ematch.
     
  3. Sep 13, 2019 #3

    mikec

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    Where did you buy these? I wonder if you got fakes.
     
  4. Sep 13, 2019 #4

    GaryT

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    No Steve like I said not very scientific just real world testing.
     
  5. Sep 13, 2019 #5

    GaryT

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    Mike, got mine off Ebay but if I got fakes so did the other guys stating the same problems.
     
  6. Sep 13, 2019 #6

    mikec

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    I'd be really surprised if a genuine duracell couldn't fire an ematch. I could easily imagine eBay would be full of counterfeit stuff like this.
     
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  7. Sep 13, 2019 #7

    rharshberger

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    iirc only the original Duracell "Copper Tops" are recommended for deployment duties, though I have used the Energizer Advanced Lithium for deployment power as well (they have a built in PTC that limits current to 5A iirc). Aren't the ProCell's a bulk commercial cheapie?
     
  8. Sep 13, 2019 #8

    UhClem

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    I found data sheets and the Procell has an internal impedance of 3 Ohms while the Coppertop is 1.7.
     
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  9. Sep 13, 2019 #9

    GaryT

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    Never ever had a problem with the Coppertop even down to 8v. Looks like I'll use these for the smoke detector lol, just ordered a box of 12 of the Coppertop's those only go in the Av-Bay.
     
  10. Sep 13, 2019 #10

    cerving

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    IMHO, 9V batteries are for smoke detectors, get 2S LiPo's. They'll pay for themselves after a couple of charge cycles/launches. For the same size, they weigh a lot less, and will source a ton more current, and they are MUCH less prone to issues with G forces and vibration. Some altimeters don't like the high-current capability of LiPo's due to small FET's, however... if you have one like that, you can throw a 1 ohm 10W resistor in series with the battery.
     
  11. Sep 13, 2019 #11

    mikec

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    Lipos certainly have some advantages, but I still like 9Vs for applications where the mass and volume don't matter, for the following reasons:

    1) easy to buy replacements practically anywhere;

    2) no need to charge;

    3) no risk of fire if damaged, improperly charged, etc.

    4) inherently current-limited which is necessary for some altimeter MOSFET circuits.

    Thanks to Gary for doing these Procell experiments. I looked at the datasheets and am still unconvinced that a legitimate Procell would behave this way; I may do some experiments of my own (though it's never occurred to me to use Procells before now.)
     
  12. Sep 13, 2019 #12

    Bat-mite

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    Geeze, the guy comes back to rocketry after years and immediately starts telling people what to do! :D
     
  13. Sep 13, 2019 #13

    GaryT

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    LOLOLOLOL...
     
  14. Sep 13, 2019 #14

    GaryT

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    Agree 110%
     

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