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Old 04-05-2012, 06:01 PM   #21
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I have herd of zapping the batteries in the last few days AND i have done it to one of my very poor weak drill batteries didnt have a welder though so i charged one battery for my drill and took the other battery apart then used the 18 volts in the still together battery to zapp each cell one at a time and without ending up in hospital results so far are more power at the moment ime leaving the battery overnight to see if it holds its charge as it doesnt do overnight ever at all b4 zapping my volts on a full charge were 18.27v after zapping and a full one hour charge my volts are now 19.76v and still strong after 3 hours so far but we will see if it works for the memory affect of the battery ime not sure it will but worth a try as its a free fix to something that would other wise go in the bin will let ya know what happens in the future
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Old 04-05-2012, 09:52 PM   #22
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A Ni-cad battery can/will develop a memory. A "zap" will brake down a hole in layer of insulation and they will work again somewhat. If you open the case you will find a bunch of cells soldered together in series. Use your electricians skills and a meter and you will find one of the cells is dead, most will be good. Rebuild your battery pack from a pile of bad ones an you will be an electrical hero.
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Old 04-07-2012, 09:00 AM   #23
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After identifying a defective cell as noted in the other posts, the best way to "zap" individual nicad cells (1.2 V) is to use a large (30 to 50-volt DC) capacitor with a DC power supply. Charge the capacitor from the power supply, disconnect from the supply, then discharge the capacitor across the SINGLE cell. This provides a short duration, high current pulse that usually restores the cell. Just be prepared, as the arcing produced when contact is first made can be startling. Higher energy setups (1/2CV^2), will remove almost any short. Multiple discharges may be necessary for lower energy setups.
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