Does such a 9V Battery tester exist??

Discussion in 'Bad Dog Cafe' started by Chiogtr4x, Oct 5, 2021.

  1. Chiogtr4x

    Chiogtr4x Doctor of Teleocity Silver Supporter

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    Ok to the point,
    Is there a 9V battery tester that might accept a 1/4" cable from my acoustic guitars' endpoint jack, to test installed batteries?

    My situation is I have 2 guitars, each takes a 9V battery, mounted inside soundhole ( end of neck) and there is no way to remove the battery ( to check or replace) w/o removing all strings, and stuffing my hand inside- it's a PITA! ( no 'low battery' indicator, just a Vol. knob inside soundhole)

    So just looking for help, if there is some?
    Don't want to have a battery die in the middle of a gig, but don't want the hassle of changing it, if I don't have to. Thanks!
     
    Last edited: Oct 5, 2021
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  2. Toto'sDad

    Toto'sDad Tele Axpert Ad Free Member

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    I'm onna sit right here until someone provides ( a rational, not snarky response to this) :lol:
     
  3. Chiogtr4x

    Chiogtr4x Doctor of Teleocity Silver Supporter

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    Did I ask something dumb here?
     
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  4. David Barnett

    David Barnett Doctor of Teleocity Ad Free Member

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    My Gibson J45 is like that. I check it by plugging the guitar into a tuner, if the tuner latches on then I know the guitar is still producing signal.

    I try to remember to put in a new battery every time I change strings. If I have one around.
     
  5. Obsessed

    Obsessed Telefied Silver Supporter

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    Just move the sound hole over a bit. Sorry to disappoint @Toto’sDad. 6D22D198-A78B-4DDE-8756-956DB9468967.jpeg
     
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  6. Si G X

    Si G X Tele-Afflicted

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    I don't think there's any way to do it.... because the voltage from the battery isn't coming out of the jack, is it? .... if it was it would be easy you could just a plug a cable in and measure the voltage at the other end with any volt meter/multi meter.
     
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  7. Mexitele Blues

    Mexitele Blues Tele-Afflicted

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    TD wanted to post a picture of his tongue, that's all.

    Really tho, get a 9V pigtail like this, and wire it in parallel with the battery. Tape the socket just inside your soundhole, so you can pull it out and use a standard battery tester on it.

    [​IMG]

    [​IMG]
     
  8. scelestus

    scelestus Tele-Holic

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    I'm no engineer (clearly!) but could you wire in a 9v battery clip parallel to the contacts for the battery itself? Then you just pull the clip out through the sound hole and test it when the instrument is not plugged in an isn't drawing any charge.

    Edit: Aaaaaaaannnnnd Mexitele Blues types faster than I do.
     
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  9. J. Bonkosky

    J. Bonkosky Tele-Holic Gold Supporter

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    No. Because the battery is feeding the guitars onboard amplifier which provides signal from your pickup to the output jack. You do not have access to both legs of the battery from the output jack of the guitar. Therefore you cannot measure the battery voltage from the output jack.
     
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  10. Timbresmith1

    Timbresmith1 Tele-Afflicted

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    Not that I know of. Not a bad idea...
    With say, a Fishman system, we used to get a few months out of a 9v in a working pro’s guitar. (Although one pretty well known guy was freakish about it- it wasn’t EJ. The other tech even told me: “Sometimes “G” gets like this. Just put the old battery back in, or tell him you changed it”.
     
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  11. David Barnett

    David Barnett Doctor of Teleocity Ad Free Member

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    How much current does a panel-mount DC voltmeter draw?

    I was thinking about the feasibility of mounting a small LCD DC voltmeter inside the guitar, so that one could always tell the condition of the battery at a glance:

    [​IMG]
    Maybe velcro it to the battery pouch.

    Unless it draws so much current that it would affect the life of the battery...
     
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  12. Old Deaf Roadie

    Old Deaf Roadie Friend of Leo's Gold Supporter

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    It is a valid question. My 2 cents is to ask why not have a battery box mounted in the back?
     
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  13. stxrus

    stxrus Poster Extraordinaire

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    That is pure genius
     
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  14. Peegoo

    Peegoo Doctor of Teleocity

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    The simplest thing to do is look at the specs for the pre your guitar's pickup uses and note the current draw in mA. Then look at the battery you use and consider usable voltage (via mA draw) over time.

    Do some simple math and determine how many hours you get off the battery.

    Remember that 99% of onboard pres are unpowered until you stick a plug in the jack. Leave your guitar plugged in when not playing it and the battery can go flat faster.

    Many of these onboard pres (especially those paired with a piezo) draw really low current and a battery will last more than a year and often start leaking before the voltage drops below a useable level.
     
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  15. Ronzo

    Ronzo Tele-Afflicted

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    I have an inexpensive Lekato classical nylon string acoustic-electric that had a similar problem. Very difficult to change the battery. I solved it by making a battery clip extender from two 9V battery pigtails. Snap the clip on one end to the battery, then the other end to the preamp’s batter connector. Snap the battery into the guitar’s clip holder. Use a small Velcro cable tie to dress the extender’s cable to avoid it making noise in the body.

    Hope this helps.
     
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  16. schmee

    schmee Doctor of Teleocity Silver Supporter

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    I would be asking myself "what will I do IF the battery goes dead at a gig?" Change the situation, make the battery retrievable thru the sound hole, or something.
    I've not seen the situation you are describing, but you should be able to mount the battery where it IS retrievable to the side of the strings. Heck I can remove a soundhole pickup without taking the strings off.

    or......... as mentioned....... install a 9v pigtail for testing.
     
  17. jguitarman

    jguitarman Tele-Afflicted

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    I agree that it's a lousy design but you don't have to remove the strings to gain access, just loosen them until your hand fits in. Still a pita but not as bad as having to remove the strings.
     
  18. Buckocaster51

    Buckocaster51 Super Moderator Staff Member Ad Free Member

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    I have a guitar, it may be a Martin 000-1e, that has a low battery indicator on the little control panel thingy on the butt-end of the guitar. I think that is also where you access the battery.

    But that does you no good.

    Maybe you should include a string winder and spare battery in your gig go-to bag.
     
  19. hunterfryellis

    hunterfryellis TDPRI Member

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    Is no one gonna say "Lick it"?
     
  20. Midgetje94

    Midgetje94 Tele-Afflicted

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    Well… you see. You take the battery put it flat side down on a table. Place a quarter on the top. Then try to get the quarter. You’ll know if it’s good or not.
     
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