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Old 01-26-2013, 07:12 AM   #19
Topspin_80
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Join Date: Jun 2012
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Quote:
Originally Posted by jam54 View Post
Regarding batteries for tennis ball machines: SLA (sealed-lad acid) are still the most practical and affordable option. Lithium batteries are very expensive and may not work with all applications.

Ultimately, battery life and effectiveness has more to do with the owner's
charging procedure than the type of battery used. Depending on the type of charger, an 18Ah lead acid battery will last 3-4 years with normal use and provide over 2 hrs of playing time on a charge. I think it's pretty unusual for any individual to use a ball machine for more than 2 hrs at a given session unless you a teaching pro.

But a battery is only as good as how it is charged. Most ball machine companies, such as Tennis Tutor, only use "smart" chargers. Smart chargers
will not overcharge the battery (one of the enemies of batteries) and make it
very convenient to recharge. If a machine is inactive for a long period and not charged, batteries will deteriorate -- another reason smart chargers are effective to prolong the life of lead acid batteries.

There is always the chance of getting a "bad" battery but that is pretty rare. So ultimately, I think the answer is to follow the charging procedures and not try and reinvent the wheel.
Regarding batteries for tennis ball machines:  SLA (sealed-lad acid) are still the most practical and affordable option.  Lithium batteries are very expensive and may not work with all applications.


How do you know that?? Do you have first hand experience ? On what grounds are you basing that affirmation??????
What applications are you talking about .

But a battery is only as good as how it is charged. Most ball machine companies, such as Tennis Tutor, only use "smart" chargers. Smart chargers
will not overcharge the battery (one of the enemies of batteries) and make it
very convenient to recharge. If a machine is inactive for a long period and not charged, batteries will deteriorate -- another reason smart chargers are effective to prolong the life of lead acid batteries.


All the big companies , Silent Partner , Playmate , Lobster , Tennis Tutor , Wilson , they all provide smart charger , and basically it is the only way you can recharge the battery , dumb chargers don't come with the necessary plug to be used on the tennis machine .
So , bringing this subject is really dumb .
Keeping the batteries well charged , is only one part of the equation , you fail to say anything about something that is also vital for any kind of battery and not only SLA .
How much you discharge your battery is instrumental for its longevity , if you discharge your battery 100% , like I do , that is gonna kill your battery in no time .
I run my batteries to the ground , because for me is more important to get my playing time , than the cost of a new battery .
You fail to provide that important fact the DOD , with a SLA you have to keep your DOD at 50% in order to get it to last over 3 years .
With a DOD of 50% , I don't get my playing time so I have to go beyond that , and that is how I run them to the ground , and that is why I am looking for alternatives other than the external battery .

I think it's pretty unusual for any individual to use a ball machine for more than 2 hrs at a given session unless you a teaching pro.

You think , well , thinking is just not enough .

To own a tennis machine is very unusual , less that 0.01% of the tennis players own a tennis machine , so it is pretty unusual to own a tennis machine .
If you think , playing longer than 2 hrs is unusual , then you don't know many tennis players , in my club there are a lot of senior citizens that play 4 hrs 3 times a week , a whole bunch of little kids play 3 hrs once a week .
I don't think that to play more than 2 hrs is unusual .

What is really unusual is that you open an account just to post in this thread .

Looks like you have an agenda , in your second post , you only post here , you belittle Lobster , and you praise TT , how come fella ????
This thread is not for this purpose , this thread is just to share experiences with lithium batteries , if you don't have any , you shouldn't waste your time here .
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