replacing ball machine batteries with heavy duty ones

Discussion in 'Other Equipment' started by au, Feb 12, 2010.

  1. au

    au New User

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    i am about to replace the batteries in my TennisTutor Plus ball machine which originally had Yuasa np7-12 (7amps - 12v) batteries. can i replace these with heavy duty ones from a hardware store? are there any advantages to doing this? any input appreciated!
     
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  2. tpotter

    tpotter New User

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    As long as the replacement battery has the same voltage...i.e. 12 volts, you can add a larger amperage battery.

    I've never been quite sure what Tennis Tutor means by heavy-duty batteries - I think they are simply referring to higher amperage batteries.

    In general, one 14 amp battery will last longer than two 7 amp batteries wired together in series (or so I'm told).
     
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  3. rich s

    rich s Hall of Fame

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    you wire two 12v 7 a-h batteries in parallel (not series) otherwise you get a 24v 7 a-h battery instead of a 12 v 14 a-h battery.....
     
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  4. rich s

    rich s Hall of Fame

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    yes, you can....

    you want a battery that is 12v and an amp-hour rating greater than or equal to the amp-hour rating of your current battery.

    The more batteries you wire together in parallel the longer play time you will have....

    as an exagerated example, you can wire up a 12v car battery if you don't mind lugging it around.
     
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  5. tpotter

    tpotter New User

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    Rich, thanks I always screw that up parallel versus in series...you seem knowledgable on this subject do you know if...

    (1) 14 amp battery last longers (play time and/or number of charges) than
    (2) 7 amp batteries wired in series?

    I was told this, but couldn't confirm it.
     
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  6. au

    au New User

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    thanks guys!
     
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  7. floydcouncil

    floydcouncil Semi-Pro

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    If you wire two 12v batteries in series, you will FRY your machine b/c you are feeding it 24v.
     
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