And I went shopping and decided to check the price of batteries in a cheapo have-everything shop. I was surprised as they are expensive. ie - an 80 A/h SLI was around 18,000 Yen. That's gone up a lot since I last looked a few years ago.
- And I (want to) sell (more) rejuvenated ones for two or three thousand! -
So there ya go kiddies! My battery would have cost me about 20,000 Yen as it is supposed to be special. Rip the tops off and pulse them and save heaps.
* I re-sealed the plastic top by 'stitching' it around the edges with a cheap screwdriver heated by a small propane burner).
Statistics: Posted by mael — Wed Dec 24, 2008 6:53 am
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I tested it again after more than 24 hours had elapsed.
That seems like it would even pass the rigorous 'load' test for a new battery.
Hmmm! Three days!
That's 'kin' great!
Statistics: Posted by mael — Tue Dec 23, 2008 7:30 pm
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can you e-mail me
id like to help
redriderno22 @ yahoo.com
bring it all together to make it work
Statistics: Posted by redriderno22 — Sat Dec 20, 2008 9:30 pm
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"The plates are not dark brown and dark grey"
I meant that the plates were now dark brown and grey.
Statistics: Posted by mael — Sat Dec 20, 2008 6:06 pm
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They were five years old and when I tested them after they had been charged and left for a day the V was 12.5 in one and 12.6 in the other. They were in good condition for their age I think. the lady who owns and uses the wheelchair always charged the batteries via the on-board charger every time she went on a trip.
They could struggle on for a bit longer in that condition, but I wanted to fix them for her, so I pulsed them for about three days. When I returned them the V was around 13 V each. That was after 12 hours of resting. I pulsed them in parallel.
They were rated at 38 A/h, and after I pried-off the lid and got at the cells I poured in around half a litre of distilled water to get the cells just covered. I needed to add a few drops to a few of the cells during pulsing, but at the end the cells were evenly soaked, but not covered. i think this is about right.
I used contact adhesive in this case to re-attach the plastic strip which covers the cell openings.
I wonder how long these will last? I intend to test them again in a year or two. I reckon they must be good for another five years if they are pulsed and maintained with electrolyte. I intend to pulse them for a few days after two years has elapsed.
*
I'm also doing a battery for myself. It belongs in a 500 cc bike I rarely used, but I need to get it running so I can take it to the bike shop to have a worn tyre replaced.
I didn't even bother to try to start it. It has been sitting there since the spriing and before then it was only run once a month or so.
I had charged the battery manually once before. But this was just a straight DC charge.
The V was 12.03 when I got it on the bench. It is rated at 12 A/h, and the top was particularly difficult to remove. But 'coz it's mine I wasn't worried about the apprearance, so I prised the top off and I'll worry about fixing the mis-shapen lid back when I'm done pulsing it.
So - same rigmarole as always with VRLA batts ... fill the cells so that they are just covered and keep an eye open to make ure the cells don't dry out too much during the process of rejuvenation.
My battery was severely sulphated. The cells were all covered with a snowy-white fuzz of crystals.
My m/cycle battery isn't finished its dose of pulsing yet. I'll take it off tomorrow evening. But I wanted to report that after 12 hours of pulsing the cells had begun to be visibly clearer of the sulphation. The plates were becoming distinguishable from each other and the colour of the plates was turning brown.
Now after over 24 hours the plates look 'clean.' The plates are not dark brown and dark grey. - Looks like another winner.
Statistics: Posted by mael — Sat Dec 20, 2008 6:02 pm
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I mentioned I had a battery fail and that I was doing it again for the customer.
My mistake was measuring the SG when the electrolyte was low in the cells.
When I replenished the cells to near the maximum line, the SG went from the green, to half way up the red.
... That's the batt which is now well into the green with the cells at about full. And it took four extra days of pulsing.
The pulser I used was probably averaging a current draw of 2 Amps and the pulse is around 10 - 15 Amps on the setting it is on (Max).
Statistics: Posted by mael — Sat Nov 29, 2008 9:56 am
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The two cells next to the poles showed the lowest SG level.
The two end cells are at 1,260 or maybe a bit higher and the other four are around 1,300.
I'll take it back and see if it can start the diesel truck it was from.
I feel bad about it. It sure does take time! I am overly optimistic a lot of the time. It is true that some batteries can respond well in a day of pulsing. But it seems more usual for the process to take several days, and in the case of a battery which has been neglected for (?) a long time, it takes a week. The battery which I am returning tomorrow is a 95 a/h.
So on the face of it I don't think I can really grumble about getting such a large battery to such a high SG level.
Statistics: Posted by mael — Sat Nov 29, 2008 9:49 am
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grt the SG in your batts as high as possible before you turn them over
Statistics: Posted by redriderno22 — Mon Nov 24, 2008 8:19 am
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... It's about my objective of getting the electrolyte into the green zone. ie- getting the electrolyte SG at least up to 1,260.
I think that if a battery has electrolyte which has been pulsede until all the cells are in the green then the battery must be about as good as it can get.
what say you?
* Or am I going to have to tell you the answer when I find out?
Statistics: Posted by mael — Mon Nov 24, 2008 7:56 am
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I just wanted to make something clear about the batteries which may fail.
I meant that batteries I had desulphated and returned to the customer failing.
I wouldn't return a battery as 'good' if it had shorts or if the cells were reacting very slowly or in a strange way. I sort those dodgy batteries out soon after I get them on charge and see how they act after a short and relatively strong charge. (Maybe a quarter of the a/h rating).
* So I mean that it is a worry for me if any of the batteries which I feel are in good condition failing.
Of course at some time one of these will fail... a short can come at any time. I just want to avoid this situation as much as possible. If the customer feels the battery isn't as good as expected then I will assume responsibility and replace it or refund. I don't want people to walk all over me, but I'll be willing to go more than half-way IYSWIM.
Statistics: Posted by mael — Mon Nov 24, 2008 7:52 am
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