| Hermansar | Дата: Friday, 21.11.2014, 17:00 | Сообщение # 1 |
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| Revive Nicad Batteries by Zapping with a Welder
Nicad batteries often die in such a way that they won't take a charge and have zero voltage. This usually means they're shorted out by crystal dendrite growth. Here's a method of bringing them back to life by zapping those shorted crystal dendrites away with too much current and/or voltage. We'll use a welder as a power source. You could also use a car battery, a DC powersupply, or almost anything with some voltage. Charged up capacitors are popular for this because you can get a very fast pulse out of them and still limit the power. it's a lot safer that way. Excellent stills and video shot by Fungusamungus Excellent Video editing by Noahw
Charge your battery up for a few hours or overnight to make sure it's charged.
When you're sure your battery has had a fair chance to charge, check the voltage with your multimeter. Since you're reading this, the voltage is probably a lot lower than the label says it should be.
To see how much current your battery can put out, run the drill. Grab the chuck and stall it to get a feel for how much power it has.
That way you can compare the "before" to the <a href=http://www.blackbootssale.co.uk>ugg boots uk</a> "after" and see which is better.
Science <a href=http://www.cheapbestboots.co.uk>ugg boots sale</a> depends on rigorous methods like these.
I'd add one or two refinements to your methods.
If you have a batter pack that is easily openable (the Ryobi 1+ packs open nicely with 6 screws), you can do an even better job of revivng them by shocking individual (or pairs) of calls rather than the whole battery pack. This works well if you have a pack that charged has say 16.8 or so volts rather than 18, it means just 1 of the cells is at 0. You can revive the cell without jolting the rest of the pack.
Also, for a current source, I used my car battery charger (on the 6 volt setting). Since using double the normal voltage works well for shocking the cells, I used the 6 volt setting and did 2 cells at the time. Typically the 2 cells which had read 0 volts would then read about 2.8 volts (but this shock charge would be falling quite quickly). Once I got through shocking the whole batter pack and reassembling it, the 18v pack was reading around 7 or so volts, but the standard charger would still recognize it as a good pack, and be able to charge it up to the full 18v.
My car battery charger is a 10 amp charger, with 6 and 12 volt settings. If you had just a 12 volt setting, I'd suggest shocking series of 4 cells or more. I also liked the fact that my charger, when it draws too much power, switches off to cool down. I typically found the shocking 2 cells at 6 volts til it switched off (usually after about 2 seconds) was enough to re energize the cells. sometimes 1 cell wasn't recovered and I'd get a 1.3 1.4v reading) I'd shock them again, or just try shokcing the 0 volt cell again.
I might be wrong about how much voltage is needed to shock a nicad cell back to life. 3v per cell might be more than is good, but I got good results with that.
1) If you can easily open the battery pack, do so, and recover cells rather than shock the whole pack.
2) A car battery charger works really well for shocking the cells.
Hoping <a href=http://www.buynewbootsblackfriday.org>uggs on sale</a> you can help me.
Craftsman,19.2 volt batteries,3 months old, stopped taking a charge. 2 at the same time and charger was not getting warm.
Before buying a new charger, I tried my batteries on a friends' Craftsman portable charger that plugs into your cars' cigarette lighter and they charged perfectly.
Bought a new charger at Sears but no luck. No lights at all, no charge. Back to Sears and clerk tried a new battery in my charger, worked perfectly. Clerk says my batteries are bad but they continue to charge on the car charger every time.
Any advice would be much appreciated.
Thank you.
Nope' fraid not  And by trying, you've almost certainly zapped the charger circuit which means it's so much landfill now.
Lithium batteries don't "go off" the way nicads do; what happens is the cells get out of sync with each other (so one's nearly flat, while another is nearly fully charged); the circuitry detects the nearly dead one stops the battery from outputting; but when you stick it on the charger it sees the nearly full one get fully charged stops the charging process; result battery that acts like a dud nicad. The only way to fix it is to disassemble, individually recharge each cell to capacity (don't overcharge, it wrecks them), re assemble, dispose of the spare screw(s), and (in theory) as good as new. In practice, it's easier to bin it buy a replacement.
I had some Ridgid 18V batteries that sat in my garage for over a year because I got out of the building trade and didn't use them anymore. When I went to charge them for use again, they would not take a charge period. The charger flashed the lights indicating battery packs were faulty. I gave up on them, and due to the price of new ones, I was ready to sell off my whole set of Ridgid tools. I ran across some info on someone doing what this site suggested, came here and got the skinny on the method. I tried it using my car battery charger on the jump start mode which put out 14 Volts. I figured that was probably a bit low, but did it anyways. It worked beautifully, I know have 2 batteries that have been charged and re charged 2 times. This means it can take substantial amounts of time to digest up to Sundance ugg Boots 24 hours or more. As a result it stays in the blood and can interfere with other foods you eat especially sugar. When you eat sugar after eating fat, the fat in your blood will prevent the sugar from moving through the blood to starving cells. This makes your blood sugar levels rise and Sundance uggs this is a dangerous. Luckily the body has systems in place to combat situations like this. An organism found in the body called Candida helps out in <a href=http://www.laarzensaleonline-nl.eu>ugg nederland online</a> this situation by eating the sugar which makes it <a href=http://www.buyblackfridaybootsdeals.biz>uggs cyber monday</a> multiply and bringing ugg 5325 down the sugar levels. If you always have a high fat diet then you will always have a problem with Candida in that the organism will be about ugg 5325 in high levels. However high fat on the odd occasion should not be a problem.
This method works, so far. I revived several of my Boss's ni cad tools, to be exact: several RYOBI Plus batteries, and a VHF Marine radio. The grin on his face was worth it, and who really cares <a href=http://www.sheepskinbootsclearance.org>ugg boots clearance outlet</a> about how long the batteries last.(post defibrilation) the fact that they work at all has made the lasting impression.
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