Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Nicad battery rejuvenating
I found a number of Dewalt 18V cordless tool battery packs of the same
rating at the dump and was able to use good cells from one to repair some of the others. Afterwards, I decided to see if I could bring any of the dead ones back. I charged up a 1500MFD cap to 60V and discharged it across each dead cell and then attempted to charge them at a rate equal to 10 percent of their rating. While some would not budge others seemed to come up and so one by one I charged them for almost 20 hours at this rate. They all reached over 1.30 V at what appeared to be full charge. I marked each one after I finished with it so that I wouldn't inadvertently try to charge it again. After I finished with the last cell, I went back to look at the ones previously charged and to my surprise only one or two were at 1.25V. Some were reading below 1.0 V but almost all of them had gone dead again. It seems to me that I had employed a similar technique mentioned above in the past to revive dead nicads with some success but this time it was different. Can anyone comment on my experience here? Did I over blast these things or perhaps were they just really dead horses to begin with? Or perhaps others have used a different procedure in the past with more success. Thanks. Lenny Stein, Barlen Electronics. |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Battery life tests | Home Repair | |||
Rechargeable NiCad battery pack | Electronics | |||
Battery Problem QX4 Solved | Home Repair | |||
Deep Cycle Lead-acid Battery Tips | Electronics Repair | |||
Car and Motorcycle Battery Tips | UK diy |