I did "recover" (for a short time) a battery that had shorted plates. 1: Drain all acid from the battery 2: Hose out as much of the loose gunge as possible from the bottom of the cells. Try not to get spray on clothes etc as even diluted it will eat holes in things. 3: Filter the old acid & use to refill the case. Top up with new acid (or just replace with new - not sure what S.G. you should use for this). 4: Recharge. Good luck. It still will probably not last long. RP On 1 September 2014 11:41, Richard R. Pope wrote: > Luis, > I would say that this battery is gone and will have to be replaced. > Deep discharge LABs need to be almost fully discharged before you > recharge them. Regular auto batteries are designed to put out a lot of > current for a short time and then to be quickly charged up. Any LAB that > is left in a discharged or partially discharged state will sulfate. They > will lose a substantial part of their capacity. They will also become > very hard to recharge. Sometimes you can put them on a trickle charger > and let them charge for a long time at a very low current. You should be > able to find information on how LABs work and how to cared for them on > the Internet. > The part about them being sensitive to sharp blows and shocks is > absolutely correct. In fact they can be ruined by the counter man coming > out and dropping the battery on the floor or on the counter. Do not ever > accept a battery that you know has been subjected to this kind of > treatment. The auto battery manufacturers estimate that up to 40 percent > of all warranty claims are do to a battery being subjected to this kind > of treatment by someone between the plant and the end customer. > Thanks, > rich! > P.S. Sorry about your battery. > rich! > > On 8/31/2014 6:20 PM, RussellMc wrote: > > On 1 September 2014 02:47, Luis Moreira > > > wrote: > > > >> ... > >> alarming on low voltage and when I check, it was quite low on voltage. > >> I tried to charge it and although the charger is saying it is charged = as > >> soon as you remove it, the voltage drops of straitway. > >> Today I removed the caps and charged it again but noticed that one of > the 6 > >> cells is not bubbling up. > >> Does this means that, that cell is shorted? Is it anyway I can repair > it? > This was written by RussellMc, > > What 'quite frequently' happens is that the conduction path is broken > > somewhere inside the battery. This can happen if you hit a "bump" at > > high speed (ask me how I know :-) ) or otherwise cause a large > > physical impulse to the battery . I've read [tm] that a significant % > > of battery failures are for this reason. Auto batteries in rough use > > apparently fail often in this manner and AIUI spiral plate > > construction (eg CYCLON? *) batteries are far less prone to this > > failure mode. I do not know where the weak points are or if it is the > > cell to cell interconnects that fail (seems most likely) or if a > > partial cell can disconnect. While the latter seems less likely it > > would leave one cell with low capacity and it would probably emulate > > what you see. (The equivalent situation occurs in PV panels with > > series cells where one cell fractures part way along its length). If a > > battery cell is fully shorted you would expect the maximum voltage > > that it would exhibit just after charge is removed to be substantially > > lower than if all cells were present Russell * > > http://www.enersys.com/Cyclon_Batteries.aspx > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .