Battery Charger Repair ?

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Alang wrote:

And is limited to 4A charging. The OP's chargers are 8A, as was the one I suggested.

A "normal" unregulated high output car charger should never be used with sealed lead acid batteries. It can cause permanent irreversible damage in a single charge.

Following the former advice can leave the OP needing a new set of batteries, as well as a new (suitable) charger. The latter will need him waiting twice as long without the scooter, waiting for it to recharge..
--
Sue

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Once, and it'll kill them
That's nearly as dumb a posting as old Isacc Newton's 8-(
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On Wed, 27 Jun 2007 11:20:02 -0700, Andy Dingley

How?
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Alang wrote:

Sealed lead acid batteries can gas during charging. If the battery is charged incorrectly, the gases produced may not be recombined back into water as fast as they are being produced. Pressure valves will eventually trip and the gas vented - resulting in permanent loss of electrolyte. Allow this to continue and there will be no electrolyte left..so one incorrect recharge *can* kill the battery.
Charging at much too high a current can lead to the internal structure of the battery deforming. If this leads to a short between plates, the result can be catastrophic.
Pressure relief valves are often non-resettable - they are there only to stop the battery exploding under fault conditions. Once such non-resettable valves have tripped*, gases will not be contained and further recombination will not happen. Even correct charging can result in gassing and loss of more electrolyte.
etc.
*They can do so with enough force to send the the valve cover 20 foot or more across the room. BTDTGTTS.
--
Sue



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They're probably SMPS which can be time consuming to fault find and repair, and not always possible to get certain spare parts for.
If you look at the usual suspects - CPC, RS components etc, you should be able to buy a suitable charger for a lot less than that. You'll need to ascertain what type of batteries they use. SLA types need a different charger from 'wet' lead acid.
You'll probably need to have the correct output plug fitted. A neighbour's one uses an ordinary 3 pin XLR connector as used for microphones.
--
*Therapy is expensive, poppin\' bubble wrap is cheap! You choose.

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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wrote:

Often the output caps, a TV repair shop should be able to check and replace them.
If DIYing remember to put new ones in the right way round ;)
cheers, Pete.
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A _what_ shop ?
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Pete C wrote:

Is "the right way" defined as "the way they don't pop", ir is it more technical than that?
Owain
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Most electrolytics are polarised and have the negative marked. Unlike other types of caps which aren't polarity sensitive.

--
*A fine is a tax for doing wrong. A tax is a fine for doing well*

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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Dave Plowman (News) wrote:

I knew that :-)
But if you put it in the wrong way round does it just pop or would something else bad happen? I.e. would trial and error with one spare capacitor suffice?
Owain
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Be sure to plug the uncased supply into a hard-to-reach socket just before putting it down on your lap...
Not usually a pop, more 'this power supply will self destruct in FIVE seconds' c.f. James Bond.
cheers, Pete.
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Pete C wrote:

The last time I played with electrolytics and a 9v battery they swelled and elongated gently until finally squeezing some fluid out in a little dribble.
Owain
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Owain wrote:

Life is full of disappointments.. ;)
Electrolytics have weakened fracture lines in the top now - in the past it was entirely possible for the case to detach and literally rocket off the board..especially with valve equipment using high voltage capacitors.
A 9v battery will have a fairly high internal impedance and won't be able to dump a lot of energy very quickly into a faulty component. Hence the result of a fault will be a little tame.
Similarly, a well-designed switch mode power supply will sense that an overload is present and shutdown - before a lot of energy has been transferred from the mains side of the hf transformer. There are mains side capacitors that can fail fairly dramatically.
However, for real excitement, try a UPS... A lot of 12v lead acid batteries in series, a lot of stored energy, a very low source impedance. It can sometimes be difficult to actually *find* the capacitor..
--
Sue

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Could be but not exclusively.

And equally important make sure they are low ESR ones.
--
*Be nice to your kids. They\'ll choose your nursing home.

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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Where are you, and how heavy are they ?
I can take a look if you want
www.cetltd.com
--
geoff

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wrote:

Hi,
One of these should do if you can change the battery connector over:
<http://www.maplin.co.uk/module.aspx ? ITAG=SPEC&ModuleNo=48447&doy=28m6#spec>
Poss a bit cheaper on Ebay.
cheers, Pete.
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Or try here:
<http://www.fasteronline.co.uk/smart-charge-battery-charger - p-3097.html>
cheers, Pete.
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wrote:

Thats the Maplin one but 11 cheaper. Doesn't supprise me ;)
<http://www.fasteronline.co.uk/smart-charge-battery-charger-p-3097.html
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FKruger wrote:

Thanks for the link, Pete and "F". I hadn't come across this company before. They seem to ahve some good kit at a reasonable price.
--
Sue



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