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Sci.Electronics.Basics -> what will happen if an SLA battery is overcharged for a few hours?
There are 6 messages in this thread.
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Say, 4 hours? To 8.3VDC?
Battery still works, but for how long...?
Long story. To summarize: I won't trust those cheap Chinese chargers
anymore.
Should have used my LM317, but I trusted them... ha
Michael
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Author: Phil AllisonDate: 02:52 02-04-08
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<mrdarrett@gmail.com>
> Say, 4 hours? To 8.3VDC?
>
> Battery still works, but for how long...?
** When fully charged and under charge, a SLA battery voltage rises to about
2.75 volts per cell. So 8.25 volts for a 3 cell battery.
If charging continues at high current ( say at the 1 hour rate) - the cell
will explode violently.
I once knew a fellow who fell asleep while trying to quick charge his 12
volt SLA - he woke up with a HELL of a fright with bits of SLA battery
all over the bedroom !!
....... Phil
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On Apr 1, 11:52 pm, "Phil Allison" <philalli...@tpg.com.au> wrote:
> <mrdarr...@gmail.com>
>
> > Say, 4 hours? To 8.3VDC?
>
> > Battery still works, but for how long...?
>
> ** When fully charged and under charge, a SLA battery voltage rises to about
> 2.75 volts per cell. So 8.25 volts for a 3 cell battery.
Say, where did you get the 2.75V per cell figure?
This site http://www.batteryuniversity.com/partone-13.htm says that
2.50V/cell is pretty much the max for SLAs, with the exception of
Hawker Cyclone batteries (2.60V).
Yep, I forgot to mention, I'm charging 6V SLA, with a wall-wart power
supply that's limited to about 1A max.
>
> If charging continues at high current ( say at the 1 hour rate) - the cell
> will explode violently.
Ok, thanks. That hasn't happened to me yet... ;-)
> I once knew a fellow who fell asleep while trying to quick charge his 12
> volt SLA - he woke up with a HELL of a fright with bits of SLA battery
> all over the bedroom !!
>
> ....... Phil
Michael
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Author: Phil AllisonDate: 19:01 02-04-08
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<mrdarrett@gmail.com
"Phil Allison"
>>
>> ** When fully charged and under charge, a SLA battery voltage rises to
>> about
>> 2.75 volts per cell. So 8.25 volts for a 3 cell battery.
>
>
> Say, where did you get the 2.75V per cell figure?
** Some of us have actual experience of things - dickhead.
You only need a voltmeter to verify the figure with any SLA battery.
Make sure it is an SLA battery, not a wet cell that outgasses when
overcharged.
...... Phil
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On Apr 2, 4:01 pm, "Phil Allison" <philalli...@tpg.com.au> wrote:
> <mrdarr...@gmail.com
> "Phil Allison"
>
>
>
> >> ** When fully charged and under charge, a SLA battery voltage rises to
> >> about
> >> 2.75 volts per cell. So 8.25 volts for a 3 cell battery.
>
> > Say, where did you get the 2.75V per cell figure?
>
> ** Some of us have actual experience of things - dickhead.
Some of us actually know how to read and cite references. None of the
ones I found recommend as high a voltage as 2.75V per cell.
So, I ask you again. Where did you get the 2.75V per cell figure?
Put up or shut up.
Michael
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Author: Phil AllisonDate: 19:40 02-04-08
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<mrdarrett@gmail.com>
"Phil Allison"
>
>>
>> >> ** When fully charged and under charge, a SLA battery voltage rises to
>> >> about
>> >> 2.75 volts per cell. So 8.25 volts for a 3 cell battery.
>>
>> > Say, where did you get the 2.75V per cell figure?
>>
>> ** Some of us have actual experience of things - dickhead.
>
>
> Some of us actually know how to read and cite references.
** Which clearly does NOT include you - you fucking tenth wit.
The link you cited simply did not include an SLA charging curve that
extended into the overcharged condition.
> None of the
> ones I found recommend as high a voltage as 2.75V per cell.
** The topic is as per your heading - ie, * overcharging* !!!!
So has got NOTHING to do with any * recommended * usage conditions.
You monumentally stupid ASS !!!
> So, I ask you again. Where did you get the 2.75V per cell figure?
** Answer already given - then snipped out of sight by you.
You are clearly yet another PITA autistic moron.
Pedantic to complete absurdity.
FUCK OFF
...... Phil
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