lxgoldsmith
10 W
I'm looking for good, reliable info, so could we please stop this unnecessary arguing? Thx
As a beginner, I need some input for testing. I began with 250 cells for my electric bike to test and don't want to spend night and day picking at them with my multimeter and a light bulb. I'm halfway through opening the packs. So far, I'm getting mostly seemingly good cells at a safe voltage.
Because they're used, I have to cut and pull the tabs to test each individual cell. I've had about 3 dead cells total, each in parallel with good cells.
Right now, I have between 30 and 50 cells in parallel (cardboard box + aluminum foil) bulk charging to 4.2V on an imax b6. I think I need to let it sit for atl 2 weeks to measure self discharge. I hope to finish testing by mid-may. If I decide not to test capacity, I'll sell the good ones on ebay for a profit and buy *new* laptop batteries that can be wired with the tabs on.
Since I'll be charging on a balance charger, will I need a bms for balancing and limiting lower voltage during discharge, or am I fine with a voltmeter / battery indicator?
What percentage of good cells should I expect to get out of the self-discharge test?
After putting them in parallel, should I discharge with the light bulb or my imax b6?
As a beginner, I need some input for testing. I began with 250 cells for my electric bike to test and don't want to spend night and day picking at them with my multimeter and a light bulb. I'm halfway through opening the packs. So far, I'm getting mostly seemingly good cells at a safe voltage.
Because they're used, I have to cut and pull the tabs to test each individual cell. I've had about 3 dead cells total, each in parallel with good cells.
Right now, I have between 30 and 50 cells in parallel (cardboard box + aluminum foil) bulk charging to 4.2V on an imax b6. I think I need to let it sit for atl 2 weeks to measure self discharge. I hope to finish testing by mid-may. If I decide not to test capacity, I'll sell the good ones on ebay for a profit and buy *new* laptop batteries that can be wired with the tabs on.
Since I'll be charging on a balance charger, will I need a bms for balancing and limiting lower voltage during discharge, or am I fine with a voltmeter / battery indicator?
What percentage of good cells should I expect to get out of the self-discharge test?
After putting them in parallel, should I discharge with the light bulb or my imax b6?