How can i revive a battery pack on my cordless drill?

I have two battery packs for my 18v Dewalt drill and neither will take a charge. Is there a way to revive them so they will charge up?How can i revive a battery pack on my cordless drill?I've tried using the freezing and heating method, but it did not work. Here's a method of bringing them back to life by zapping those shorted crystal dendrites away with too much current and/or voltage. You can use a welder as a power source. You could also use a car battery, a DC powersupply, or almost anything with some voltage. Make sure to wear eye protection, match negative with negative and positive with positive, and zap it for 1 - 2 seconds a couple of times and it should be good as new. I 'd hook up the negative side to the battery first. Then touch the positive to the positive side. You want to see some sparks - it is normal and not to worry. If you're not sure which is positive or negative on the battery, you can use a volt meter - use the meter also to measure the almost immediate result before and after the battery has been zapped. Repeat the process if the battery is still not holding charge, but I can assure you that you will see a big difference almost right away. The battery companies do not want us to know about it so they can continue to rip us off. Good Luck!How can i revive a battery pack on my cordless drill?No simple way as rechargeable batteries have a limited number o fcharge and discharge cycle, around 200 to 500. After that, it's dead and will need a new one.How can i revive a battery pack on my cordless drill?some people say freeze them some say heat them i say buy new ones

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