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'[EE]Sealed Lead Acid Charger'
2006\01\07@204442 by Steph Smith

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All of the newer chargers i've pulled apart (well you HAVE to!)
i.e not the bridge rec. and SCR 'boilers' of yore,contain charge
management I.C.'s of some description;even in the cheapest
domestic 'home' car chargers.(the main cost in producing a
charger is the cost of the transformer)These usually take care of
problems such as shorted cells (won't charge) reverse
connections(won't charge) sulphated plates (wont charge)
indeed they are so 'paranoid' i keep a 'kick-in-the-pants'
old fashioned charger to recover batteries to a state in which
newer ones will take over without switching off constantly!
One one memorable occasion i used the boost-start
setting (140A!)and flicked the power on and off to
revive a 650Ah 12v van battery which had gone totally 'flat'.
Although i wouldn't recomend it; it remained in use for six months
and was still in the van when i sold it...i think experiments like this
prove one thing at least; Batteries CAN'T READ;^)

2006\01\08@014021 by Steve Smith

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Boilers??????

Can I point out that the bulk of UPS chargers are SCR based and charge
batteries at 400v (ish) if the battery voltage is maintained at 2.25-2.27
vpc the battery design life is often obtained if the battery temperature is
kept in the 18-22 deg window. Automotive batteries and chargers are not
built to the same quality of materials as standby batteries and their
chargers. There is product available now with a 15 year design life for a
sealed (VRLA) battery. Typical automotive construction materials would not
expect to see more that about 4 years life for the battery.

Rgds Steve..

{Original Message removed}

2006\01\08@192309 by Steph Smith

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>Boilers??????
The point i was making was about the fierce charging
regimes inflicted by cheap car chargers.I believe the
main reason for the long life of UPS batteries is not strictly
because of their quality;but due to the fact they are a
'float' type cell not a 'cyclic' one; which become 'washed-out'
far quicker,and tend to deliver much higher short-term
currents;meaning internal resistance changes render them
no longer fit for service as starter batteries.If the original
post was as i thought about producing a inexpensive
(not 'cheap'!) but reliable charger,then as you quite rightly say
well designed SCR chargers still take a lot of beating.
The main reason for the rise of charge control I.C.'s
is the sometimes impossibly fast charge times demanded by
consumers;which make designing a 'traditional' charger
very difficult..%<(

2006\01\08@194301 by David VanHorn

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On 1/8/06, Steph Smith <spam_OUTzapsmithTakeThisOuTspamblueyonder.co.uk> wrote:

> >Boilers??????
> The point i was making was about the fierce charging
> regimes inflicted by cheap car chargers.


I see that mistake made in the ham community.. It says "charger", so it must
be ok to leave it connected to the battery for a month, right?  :)

2006\01\09@040739 by Russell McMahon

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> I see that mistake made in the ham community.. It says "charger", so
> it must
> be ok to leave it connected to the battery for a month, right?  :)
> --

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