Re: Sealed Lead Acid Battery


Mar 29, 2005

 


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#9033 Mar 29, 2005

Hi there,



Would like to ask some guidance from you guys if you

guys don't mind. Thanks a lot in advance.



For a Sealed Lead Acid Battery (SLA), is it true that

it can be left on a charger unit which has the ability

to regulate its output to the float voltage for a very

long period of time without damaging the battery?



Means, say a 12V SLA battery is in the process of

charging. As it reaches 12.6V or above, it is

considered as fully charged, right? Then, since the

charger unit regulates its output votlage to 13.5V,

which is the float charge of the 12V SLA, does it mean

that it will be fine to let it remain connected to the

charger for a long period of time?



Another case, would be, say a fully charged battery,

being connected to the same charger which has the

ability to regulates its output voltage to 13.5V.

Since 13.5V is the float voltage, it is again, fine to

leave the battery connected to the charger, is this

right?



Advice or comments needed. Thanks in advance.





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----------------------------

#9034 Mar 29, 2005

Not that i know for sure - But i think so - Think of a Car battery - it is the same principle - When driving a long time, say 10 hours straight you don't need to consider the battery...



As long as you consider the heat build up and the fumes it should be ok - but as I said, its only a qualified guess..



/Stig





-----Original Message-----

From: Devon Lee [mailto:devonsc@...]

Sent: 29. marts 2005 20:38

To: piclist@yahoogroups.com

Subject: [piclist] Sealed Lead Acid Battery





Hi there,



Would like to ask some guidance from you guys if you

guys don't mind. Thanks a lot in advance.



For a Sealed Lead Acid Battery (SLA), is it true that

it can be left on a charger unit which has the ability

to regulate its output to the float voltage for a very

long period of time without damaging the battery?



Means, say a 12V SLA battery is in the process of

charging. As it reaches 12.6V or above, it is

considered as fully charged, right? Then, since the

charger unit regulates its output votlage to 13.5V,

which is the float charge of the 12V SLA, does it mean

that it will be fine to let it remain connected to the

charger for a long period of time?



Another case, would be, say a fully charged battery,

being connected to the same charger which has the

ability to regulates its output voltage to 13.5V.

Since 13.5V is the float voltage, it is again, fine to

leave the battery connected to the charger, is this

right?



Advice or comments needed. Thanks in advance.





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----------------------------

#9035 Mar 29, 2005

Hope this help; www.uuhome.de/william.darden/carfaq.htm

Stig J.rgensen stig.joergensen@...> wrote:Not that i know for sure - But i think so - Think of a Car battery - it is the same principle - When driving a long time, say 10 hours straight you don't need to consider the battery...

As long as you consider the heat build up and the fumes it should be ok - but as I said, its only a qualified guess..

/Stig

-----Original Message-----From: Devon Lee [mailto:devonsc@...] Sent: 29. marts 2005 20:38To: piclist@yahoogroups.comSubject: [piclist] Sealed Lead Acid Battery

Hi there,

Would like to ask some guidance from you guys if youguys don't mind. Thanks a lot in advance.

For a Sealed Lead Acid Battery (SLA), is it true thatit can be left on a charger unit which has the abilityto regulate its output to the float voltage for a verylong period of time without damaging the battery?

Means, saya 12V SLA battery is in the process ofcharging. As it reaches 12.6V or above, it isconsidered as fully charged, right? Then, since thecharger unit regulates its output votlage to 13.5V,which is the float charge of the 12V SLA, does it meanthat it will be fine to let it remain connected to thecharger for a long period of time?

Another case, would be, say a fully charged battery,being connected to the same charger which has theability to regulates its output voltage to 13.5V.Since 13.5V is the float voltage, it is again, fine toleave the battery connected to the charger, is thisright?

Advice or comments needed. Thanks in advance.

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----------------------------

#9036 Mar 29, 2005

As long as the battery doesn't overheat it's OK to float-charge lead-

acid batteris. I've designed battery chargers for aircraft

applications but I'm familiar with the algorithms of most commercial

charger controller ICs. They crank down the current as the voltage

climbs to the float level so you don't get too much float current.

Once a battery is charged, the heat out is = to power in, so for

example, a 50mA float charge into 13.5V creates .7W of power.






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