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Thread: waking the dead

  1. #11
    Thank you mikey, I suppose it is high time to build me a cap dump and start sloshing the battery a bit. I've been staring at schematics long enough. I did get a nice long discharge out of the battery anyway, about 20 hours. by the end I was only drawing 1/4 of an amp though and the voltage was at 10.1 volts. Aln

  2. #12
    Well, had an interesting weekend. Started working on cap dump, had some issues. Then a magnet broke through the plastic on my 3pm kit rotor (it was weakend from problem I mentioned in another thread) and I found it to be stuck to the bottom of one of my coils, neo of cousre. So I stole a transistor from that circuit, as I ran out of them, and reworked my bike wheel 14 awg circuit, all the while mixing up some alum for a couple more battery's. Big wheel keep on turning, back in business. Aln

  3. #13
    2 steps forward and 1 back


  4. #14
    Built a comparator cap dump based off of Patrick's design and started charging the JD battery again last night. this morning it was up to 15.85 volts and I disconnected it. Then I unhooked it and a few hours later it was 12.34 so I put a load on it and it has been going for several hours at a half an amp and is still 11.3. I think I am still having issues with that one cell, but remember I did have 2 bad cells when I started. I will continue this for a few days maybe a couple weeks, before I give up on it and make it a door stop. It is still useful for led lights even with a bad cell though. Aln

  5. #15
    Thought I would finish this thread off as I just left it unfinished and the conversion actually was a success. The John Deere battery has been sitting for months used very little and not charged fully till 2 days ago. I charged it up to 16.17 volts with conventional charging type and let it sit for 2 days. It was resting at 11.73 tonight so I put a LED lamp that draws .5 amps on it at 8:20 pm. I'll show results for a couple cycles, to show this battery has been awaken from the dead, even though the inductive spike wouldn't fix it before it was converted to alum. The Alum battery has a lower standing voltage than a standard lead acid battery. Aln
    Last edited by aln; 09-05-2014 at 05:11 AM. Reason: changed amp draw

  6. #16
    So I at first put a 2 amp load but it appeared that I may have had a surface charge on the battery as it went down fast, so I put a half amp load and ran it until 06:30 this morning, 10 hours. The battery was sitting at 9.59 volts and the light was drawing less than 200 mA. Not so wonderfully successful as I claimed above, so I am charging again.

  7. #17
    drain the battery to zero, tie the end with wire leave overnight, and using a constant current charger back charge the battery at a very low ma level you will see the battery resistance drop, dont do it for to long, like is shown on bedini youtube video, then charge it back up using constant current do it quite slowly, i have had good sucess bringing dead batteries back like this, however if you can avoid doing it then don't, i imagine all sorts of debris being taken off the plates.
    i use a high performance Ni cad / Ni mh charger for this purpose it has V and A on the display.
    if you've got a stubborn battery or even an internal short or a cell that refuses to charge, this does work.

  8. #18
    charged it up slow to 15.54v and then discharged it at 2 amps to 7.87v. Took about 8 hours. It was a 160 cca I think, so roughly an 8 ah, it will do that just fine. Aln

  9. #19
    Hi Alan, BMW
    just found this thread tonight , tho i have followed many of your other threads on diffrent things , i built my ssg wheel a few months ago and began the looking and learning curve on trying to restore batterys , so far all i have just been running in mode 1 , setup is teslagenx 8 trans board with coil .

    I couldnt even get my wheel to run for 3 weeks or so because of beginner mistakes and lack of understanding and finally in desperation went to you tube and built a single trans board with a to 35 tran from an old tv and finally got it to run workin out where i went wrong with the 8 tranny board setup

    I started with 5 Gill g-35 aircraft batterys and 3 garden batterys and have had some success restoring 3 of the aircraft batts to good standing voltages, the other 2 are still in progress.....i have a garden batt that started out around 3 volts that had been sitting in the shed for 3 or 4 years that i have been able push to 15.2-15.4 volts on the wheel after many cycles but it really just seems like a surface charge it stands around 12.57 but will not turn over a garden tractor...i noticed in 1 cell the acid is dirty looking kinda murky "bubbles more when shorted as well ", i guess from contamination interior of the battery and perhaps from exterior as well ......i drained the cell and replaced it with electrolite from other batterys that was clear and tried it again and still seems just to have a surface charge ..no cranking amps it seems .

    i was wondering if there is any way that the acid in the electrolite could go bad or get weak from the constant topping through cycling .if you have any thoughts on this please share them........

    i have a few batts that are shorted and i think i will try aln,s method and just convert them to alum.........cheers

  10. #20
    Patrikas,
    Hello, Does it freeze where you live? If so are your batteries bulged out on the ends? If so you may have a short that can not be fixed. Also, I put a lot of effort in the grey interstate battery in the video above with no success, it would charge up to 15 volts but internally had a short as it would drain itself. Some can not be fixed is what I am trying to say. As BMW has mentioned trying to completely discharge it can sometimes work. As far as you question about the electrolyte getting weak; that is anther way of saying there is hard sulfate on the plates or that it has been charged many times with high current and little pieces of lead sulfate fell to the bottom of cells and changed the chemical balance. Excessive bubbles in a cell indicate that cell is shorted internally. If it is just little pieces of lead sulfate a few thorough rinsing's will fix it. If plates are touching you will not fix the cell unless you cut the battery apart and manually fix it. To me, that would just go to the scrap yard. 2 excellent video resources are "Battery Secrets" and "Battery Rejuvenation" by Peter L. and Aaron M. Where safety glasses and old clothes Aln

    You could put a 12 car bulb on the batt and watch the voltage for an hour. If it drops to 10v you have a bad cell. Also, alum batteries aren't good in the cold. They are not good starting batteries as their voltages are lower per cell. that red and black one in the video above is mixed with H2SO4 and Alum, it has a standing voltage of 12.24, which would be considered a dead battery if it were just a lead acid.
    Last edited by aln; 09-09-2014 at 09:38 AM. Reason: add more info

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