Sealed lead acid batteries

[Ted Pillinger]

Hi

What is the fastest rate of discharge advisable for a sla battery?
Is the terminal voltage a good indication of the condition of a charged
battery?

Thanks

Ted

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[Phil Allison]

"Ted Pillinger"

What is the fastest rate of discharge advisable for a sla battery?

** Just a tad less than that required to blow the internal fuse.

Is the terminal voltage a good indication of the condition of a charged
battery?

** No.




....... Phil

 

[Chuck]

On Tue, 25 Mar 2008 09:03:37 GMT, "Ted Pillinger"
<ted.pca@ntlworld.com> wrote:

Is the terminal voltage a good indication of the condition of a charged
battery?

If by condition you mean state of charge, then terminal voltage is
about the only indicator available. Terminal voltage doesn't vary much
between 50% and 100% charge, but it provides a rough indication. If
you try to measure terminal voltage right after charging, you are
likely to see an elevated, incorrect reading.

If by condition you mean battery capacity, terminal voltage by itself
will tell you nothing.

Do a search on battery faq and you'll find more info.

Chuck


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[Bob]

On Mar 25, 10:44 am, "Phil Allison" <philalli...@tpg.com.au> wrote:

"Ted Pillinger"

What is the fastest rate of discharge advisable for a sla battery?

I'd say the rate advised by the manufacturer in the data sheet

** Just a tad less than that required to blow the internal fuse.

Do SLA batterys usually have an internal fuse?
I'v never seen any mention of one in manufacturer's literature.
I have seen the aftermath of people short circuiting large gelcell/AGM
batterys and heard storys of other incidents. This is almost allways
due to people using an uninsulated spanner and rotating it so it
touchs another battery terminal or the chassis, although ocasionally
people put a link lead on the wrong terminal.
I'v never heard of a battery fusing, if the short is cleared after a
few
seconds the batterys works afterwards.

Is the terminal voltage a good indication of the condition of a charged
battery?

** No.

In my experiance the off-load off-charge voltage of a
charged SLA battery only gives a meaningfull indication
when the battery is near the end of it's life.
When the battery has only a fraction of it's capacity left,
in the region 10% of the original AH rating,
the voltage drops quickly off charge,
eg if a nominal 12volt battery is at 12.5V instead of 13.5 straight
after being taken off charge it probably has significantly reduced
capacity and will probably be useless within a year.

Bob

 

On 3ÔÂ25ČŐ, ĎÂÎç5Ęą03ˇÖ, "Ted Pillinger" <ted....@ntlworld.com> wrote:

Hi

What is the fastest rate of discharge advisable for a sla battery?
Is the terminal voltage a good indication of the condition of a charged
battery?

Thanks

Ted

--

Please identify yourself in name or subject in any replies or they will not
be opened.

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[Phil Allison]

"Bob"
"Phil Allison"

"Ted Pillinger"

What is the fastest rate of discharge advisable for a sla battery?

I'd say the rate advised by the manufacturer in the data sheet

** Just a tad less than that required to blow the internal fuse.

Do SLA batterys usually have an internal fuse?

** Many of them do.

If you short or overload the battery - the battery goes open.

It's a simple safety feature against explosion.



....... Phil

 

On 3ÔÂ25ČŐ, ĎÂÎç5Ęą03ˇÖ, "Ted Pillinger" <ted....@ntlworld.com> wrote:

Hi

What is the fastest rate of discharge advisable for a sla battery?
Is the terminal voltage a good indication of the condition of a charged
battery?

Thanks

Ted

--

Please identify yourself in name or subject in any replies or they will not
be opened.

Do you want access to China's massive pool of electronic
manufacturers... but lack the time to contact suppliers, negotiate
contracts, arrange shipping or monitor product quality? Don't worry -
Let seriouswholesale deal with all that for you.

*Check out the huge range of Gadgets, MP3 / MP4 Players, Car DVD /
Audio, and Computer Accessories now by visiting the online wholesale
catalog at seriouswholesale. com You'll have peace of mind thanks to
the seriouswholesale Quality Control, 12-month Warranty on all
products, and easy secure payment by credit card through Paypal.

Selling on eBay or your own online store? Send products direct from
our warehouse to your customers using our unique drop-shipping
service. You can profit by selling hundreds of different products,
without holding any of your own inventory! Any questions you have will
be answered by the seriouswholesale English-speaking customer support
team... Their aim is to make your China electronics importing business
easier to run than ever before.

Welcome to http://www.seriouswholesale.com.

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