Results of testing old batteries which have been desulphated

[Amr]

[SeaMonkey]

[Amr]

[SeaMonkey]

[mael]

[mael]

[mael]

[Amr]

[Amr]

Hey every one: Merry Christmas and I hope you have a happier coming year‎

It took me a while tile I could tell you about the progress I made, I was hoping it would ‎be a good one but unfortunately, it doesnt seem so.‎

I received my new toy, a generator for 0 - 39 V on a 2 A transformer, the transformer is ‎the source of power that I hook into the battery, with pulsed output for 0 - 2kHz, also it ‎has a 4 range duty settings (from 10% till 90%)‎

When I first received it, it's output transistor did not succeed in handling high amp output, ‎so I had to repair it by asking my friend to increase the output transistor capability by ‎adding 2 more transistors in parallel, now they are three and since I received it back ‎‎(yesterday), it did not complain and managed to handle the max output that I tested it ‎with.‎

Repair time for the generator was about a week, which I decided to use in monitoring the ‎behavior of a dead battery that I wish to repair (other than the first one) it is 70 Amps, ‎liquid LA.‎

It's v when I gut it was 10.2, so I was a bit optimistic about it, I added water to the top ‎level, opened the caps and left it hooked to an automatic charger for few days (a 12A ‎charger) this in normal batteries should take few hours to fully charge it and to allow it to ‎go into trickle charge state, after few days, it was still accepting about 3 A charge, so it ‎never really gut fully charged, in fact when I removed the charger, the battery only gave ‎me 11.3 V and started dropping, it never got too hot to touch.‎

The specific gravity for 4 of the 6 cells improved while charging, and these cells where ‎the ones that were bubbling while under charge, the other 2 (at the negative pole end) did ‎not bubble and did not improve in regards of specific gravity, so I recon these are the ‎defected cells.‎

Now what I did was to hook up the generator from last night till now (over 12 hours) and ‎starting altering frequency, V and duty cycle. ‎
All cells bubbled except for the 2 ones that I believe they are defected. Not even at 39 V ‎and 2kHz. Reading at the battery’s end never passed 13.5 v although generator’s output is ‎‎39 V. I will leave it hooked for now as I have to go to work, but I dont think that I'm ‎doing it right, you guys say that signs of accepting repair should show almost ‎immediately as far as I understood, and that it usually takes only few hours to max a ‎couple of days for full repair (for a battery that is repairable of course).‎

Do you see something wrong in my configuration? if so, please correct me. I also built ‎another pulsar with variable duty cycle based on the 2 X IC555 circuit, I will connect this one ‎to my first circuit (40 V transformer and 5 X 6800 mf capacitors in parallel) and I hope that ‎by tomorrow I can start using it, it still needs a frequency counter as the oscilloscope I ‎have is an add on card to the pc and is not easy to use it where the batteries are.‎

[mael]

[Amr]

[Amr]

[mael]

[Amr]

[mael]