tennis tutor battery replacement.

Discussion in 'Other Equipment' started by 2ndServe, Mar 9, 2013.

  1. 2ndServe

    2ndServe Professional

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    Hi where do you guys order your replacement batteries?

    Thanks
     
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  2. beernutz

    beernutz Hall of Fame

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  3. Lakers4Life

    Lakers4Life Hall of Fame

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    I paid $75 for a 12V18AH from Lobster, but I probably could have gotten the same or similar battery for $45+shipping. If you can read the model number off your battery you can easily find one online, or locally. I was told my battery is the same as a Power Wheels battery.
     
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  4. retrograde

    retrograde Rookie

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    A great place to get SLA batteries for ball machines is:

    http://www.atbatt.com/

    They have all the standard SLA sizes and many brands plus you can download mfgr datasheets and their own tech tip documents.

    Amstron is their in-house brand and they carry some reliable low-cost brands like Powersonic (used by Lobster). I visited their modern headquarters while passing through Valencia, CA. Really helpfull and friendly folks.

    To replace an SLA battery, you need to know:

    - Voltage and amp-hour (AH) capacity
    - Terminal style (there are at least 3 different types)

    Note that amp-hours are NOT the same as amps! Don't confuse the two.

    Use the atbatt search engine, then look at their photos to make sure you've got the right form-factor (shape of the battery case and position of terminals). Most SLA's in the same amp-hour capacity range use the same size/shape case.

    If you don't know what your terminal style is called, just use Google and you'll find photos and names. Lobster Elites 1-3 usually use the F2 style terminal. You can also purchase terminal adapters. Here are what the F1 and F2 terminals look like:

    http://www.batterystuff.com/kb/articles/battery-articles/terminal-type-f1-f2-tabs.html

    To help others, it would be nice if you could post details or a photo of your battery.
     
    Last edited: Mar 9, 2013
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  5. 2ndServe

    2ndServe Professional

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  6. beernutz

    beernutz Hall of Fame

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    It is only a 7 AH battery; are you sure it is the one you need? Generally you want to match the volts, amp hours (AH), dimensions, and connectors with the one you currently have, although if you find one with different connectors you can sometimes buy adapters to make it work. On my last replacement I matched the size and voltage but found a battey with 22AH instead of the 21 AH the original battery had, but had to buy adapters for $1 as the battery posts were different from what the original battery used.

    I don't know anything about the quality of that battery but it is half the price of the 12 V 22AH SLA replaement battery I bought for my Silent partner Star.
     
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  7. DaveInBradenton

    DaveInBradenton Rookie

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    Just wondering: How long did your battery last?

    Did you keep it continuously on the charger when not in use?

    Thanks,
    Dave
     
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  8. 2ndServe

    2ndServe Professional

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    Dave, I don't know how long the battery has lasted, it's been handed down to me. I did not keep it continuously on the charger when not in use (I do not have the smart charger).
     
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  9. DaveInBradenton

    DaveInBradenton Rookie

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    As you know, the secret to battery life is to keep them charged. I have a Tennis Cube and was wondering how long the batteries last.

    You may wish to consider the trickle charger for motorcycles that is sold at Walmart. I have a couple of them since I own 3 motorcycles. It's probably cheaper that the Tennis Tutor version. Get the specs and compare.

    Have fun,
    Dave
     
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  10. retrograde

    retrograde Rookie

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    What Beernutz said.

    The Lobster and Edge machines seem to have batteries in the 20 AH range. I've read the SP Edge Lite comes with a 9A AH battery so it's possible Tennis Tutor might use a 7 AH SLA.

    Yuasa is a well known brand. They've been used on motorcycles for ages. You will get a lot more info and buying options by using atbatt's search engine (you don't have to buy from them if you want, but much more efficient than using Amazon). For example:

    http://www.atbatt.com/sealed-lead-acid-batteries/b/yuasa.asp

    If 7AH is what your original SLA is, check out the 9AH versions to see if they have the same dimensions.

    Here are all your 12V 7AH to 9AH options:

    http://www.atbatt.com/c/lead-acid.a...ax_value=9&sort_field=0&sort_type=-1&ut=0&p=1
     
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  11. beernutz

    beernutz Hall of Fame

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    I did a quick search of the 9 ah F1 connector batteries at atbatt.com and found at least 2 that have the same dimensions as the 7 ah one the op found. Personally I would rather have the extra amp hours for just a few dollars more. 2 extra ah is almost a 29% increase over the 7 ah battery.
     
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  12. 2ndServe

    2ndServe Professional

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    thx guys very useful info. I'm wondering if it would be easy to bypass the battery altogether. Has anyone converted their machine. Thanks
     
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  13. retrograde

    retrograde Rookie

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    I don't know. But some machines have a charger with a relatively high current output that can be plugged in while the machine is on to extend runtime over battery without charger. The downside is these kinds of chargers are a little harder on your battery.

    Try using the forum search engine to see if anyone has tried a true conversion to AC.
     
    #13
  14. jam54

    jam54 New User

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    Tennis Tutor battery replacement

    The wise thing to do is to get the battery directly from Sports Tutor. That way you know you are getting the correct and best battery available. Most of the batteries in the Tennis Tutor are two 12V batteries joined in parallel. If you source the batteries on your own to save a nickel, then you have to glue and tape them together yourself. If you don't do it properly the batteries can shift and come apart and you have problems.

    Sports Tutor uses a Enersys/Yuasa (same battery) in a 9 Ah, not 7 Ah like some people here think. So in parallel it is an 18 Ah battery. If you source batteries on your own you will likely get them cheaper than the $75 Sports Tutor charges, but in addition to the extra work, you will probably get batteries with less amp hr rating and less quality. A 7Ah battery will work fine, just give up less capacity and likely less life. Additionally, SLA batteries have a shelf life and if they have been sitting on some warehouse shelf, they lose much of their charge which is not a good thing.

    So spend a few extra dollars and get the right battery the first time from Sports/Tennis Tutor.
     
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  15. jam54

    jam54 New User

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    Since we are talking batteries, it makes sense to clear some things up on chargers as well.

    Most ball machine companies have followed Tennis Tutor's lead and provide "smart" chargers with their machines now. The smart chargers won't overcharge the battery, like the "standard" chargers, so it makes charging so much easier. You still have to remember to plug the charger into the machine when you are done using it tho. A partially drained battery will drain faster than a charged one.

    And most chargers, smart of otherwise have 1-2 amp output. You don't want much more than 2 amp because SLA batteries have to be trickle-charged, or slowly. So using an after marker charger higher than 2 amps could damage the battery. A 1 amp smart charger will recharge a battery overnight (12-18 hrs) which is fast enough for 99% of players.
     
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