Hybrid Car – More Fun with Less Gas

what voltage is lower limit for stored battery? - Page 4

register ::  Login Password  :: Lost Password?
Posted by Ulysses on August 28, 2009, 3:02 pm

My Smart Charger (12 volts) has a built-in desulfate cycle.  I have to admit
that I have seen some improvement by running it for several sessions (24
hours each) on a bad deep cycle flooded battery.  But I sure could not get
it to recover a battery that was sulfated from being undercharged.  So yes,
I was able to get the SG up a little higher, but no, the battery was still
not usable (in any practical sense).

Posted by Scott Dorsey on August 28, 2009, 4:28 pm

They will not repair a bad battery.  Once there is gunk on the plates and
the battery resistance has started to climb, the battery is dead.

The pulse desulfation is a typical feature of the battery maintaining devices,
and they prevent sulfation from happening in the first place.

"C'est un Nagra.  C'est suisse, et tres, tres precis."

Posted by Scott Dorsey on August 28, 2009, 4:27 pm

Yes.  Use one.

Most large UPS systems and big lighting charging systems now use the same
"C'est un Nagra.  C'est suisse, et tres, tres precis."

Posted by harry on August 29, 2009, 6:14 pm

On Aug 27, 2:53 pm, klu...@panix.com (Scott Dorsey) wrote:

should be

connected a

If it's lead acid, yes drain if you want to store it for a long
period. But charge it up  first and then drain it and then wash out
with distilled water.
The best plan is to sell it, & buy a new one when you need one.
Even when new, they have a limited shelf life seven stored dry.

Posted by Martin Riddle on August 27, 2009, 10:03 pm

12.65v is a fully charged  Lead acid battery
12.45v is State of charge of 75%

So your keeping your battery over 75% charged by keeping the voltage
above 12.5v, which should be fine.

For AGM I would consult the Mfg.


This Thread
Bookmark this thread:
  • Subject
  • Author
  • Date
please rate this thread