I guess I did it wrong, for sure theses are not 2005 batteries
Got them at a scrap yard last year!
I will look again, trouble with the stamp being on the lead post, easy to get messed up, I have a couple that have no marks readable, looks like the post was cleaned with a wire brush.
As for bringing back the dead, batteries that is. I think I may have done something?? :O
I got one that I had gave up on up to over 6.5V and it held longer than it ever has before. It was only around 4V when I started with it.
I had some gunk here I bought a long time ago. Probably that EDTA stuff sold under a differnt high price brand. After looking at the link for EDTA that was posted I saw it said DOES NOT DISOLVE IN ACID, disolve in water first then add. The stuff I bought did not say that and I dumped in a tablespoon of powder to each hole. I did not think it worked very well. So now I tested it, took acid from a charged battery and the stuff did not disolve very well. Used water and it did better though I had some crystals in the bottom of the yogurt cup I used. So I crunched them up with a little steel rod, I think it may have coroded the rod a bit by the time I did 12 holes.
Anyway I used warm water and added this to the batteries. All I had handy was a 12V Smart charger 2/10/20/40 amps. It does not say 6V on it anywhere, but I figured what the heck. I charged alittle at 2 amps. Did not see much happening, tried 10amps got one cell bubbling a little. Since I wanted the stuff I dumped in to mix up in there I kicked it into high gear and did a 12V 40amp charge on the 6V trojans :O
These are just a little smaller than my L16P ones and alot larger than a golf carts.
Well I got that sucker bubbling hard on the first cell and fairly well on the second two. Maybe around 5 minute tops. Then I took turns charging varius ones at 10 or 20 amps and sometimes hitting them up to 40amps. Shutting it off sometimes and sometime it would shut itself off.
When I came in I had one still holding about 6.5V that started at a low 4V (second worst one) and that one never held that high that long before.
The worst one the charger would turn on then shut off with an error every time.
I'd turn on the power and click the amp button up to 40 amps and it would run a second then shut off. I did this about a dozen times. It would only run a second even on the 2amps setting and shut off also. After about 20 tries at 40amps I was finnaly able to get the smart charger to stay on when set to 2 amps. I think the display said 3.5 amps. After a few mintutes on the 2 amps I kicked it to 10amps and it ran, then I kicked it to 20 and it still ran.
Now when I first started it would shut off in a second with the error. After I got it going the charger chargers a little then shuts down to let the batery cool or something, when it tried to start again on it's own it would shut off and give an error again. After hitting it with 10 amps and 40amps a few times and letting it run and resarting and doing it more I finnally got it to actually run like it should.
This was a 6V and the hole at the neg post was fizzling like an Alkaseltzer! Was getting some bubble from the 2 others also.
When I came in tonight all were showing about 6V or higher. I left 2 wired in series for 12V and the charger is running on those at 10 amps tonight.
When I was out there working on them I was doing each 6V one at a time as a 6V with a 12V charger. Maybe the charger kicks back to 6V? Maybe I was kicking out 80amps at 6V
with the charger instead of the 12V at 40amps?? Not sure about that?
Anyway, that's how I got them to charge up enough to show over 6V, and it has not been long enough to tell anythng yet about how well they full charge and hold a charge, this is better than those 4 have done in the past though.
Tomorrow I will check the 2 sitting and see if they held over night or drop to 4V again. And also see how well the 2 charging now seem to be. These are probably close to 300amphr? L16p is 360amphr and these are only a little smaller.
Since these were totally dead, 10hours at 10amps is only 1/3 the amphours for a charge in the morning. I geuss a C20 would be close around 15amps so 10amps should be a slow charge.
Maybe there is hope for the hopeless?