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
what will happen if an SLA battery is overcharged for a few hours?
Apr 02, 2008
4 Replies
** 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
Say, where did you get the 2.75V per cell figure?
This site
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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.
Ok, thanks. That hasn't happened to me yet... ;-)
Michael
** Some of us have actual experience of things - d*****ad.
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
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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