Comment They are opening up the packs, testing... (Score 1) 143
... and using only the "good" elements (when one or two elements fail the battery is dead for laptop use).
This is precisly what I've been doing for many years, any decent flashlight (or R/C or electronics) forum has at least one huge thread about people doing this.
I have an electric bike pack made out of the best cells recovered from (dead) laptops batteries. I've been using the individual cells for (flash)lights for years and in fact there are so many fake (or just "cheap") 18650 on the market now that if you don't know where to buy and what to buy you'll end up with something worse than a good cell from a bad 10-15 years old laptop battery. It is so bad that it is worse than SD counterfeiting...