CORDLESS POWER TOOL BATTERY HACK! HOW TO FIX THE DEAD ONES! STOP WASTING YOUR MONEY! TIPS AND TRICKS

First, I would like to say that I think that you are doing a good job of helping people learn to understand the batteries and charging systems. I want people to know that @3.54 the 20 volt reading that you got is Not the voltage of the battery that you are trying to fix. With the jumpers still attached, you are reading the voltage of both batteries wired in parallel. People who aren't really familiar with electricity can get confused by this and think that they are checking the voltage of the battery they're trying to fix. When repairing old battery packs, most of the time you are going to have to open the case and check voltage on the individual cells. One (or more) cells has usually given up and has to be replaced. (Quick FYI, If folks won't run the battery pack completely dead and will return the discharged battery to the charger when swapped, Your batteries will last many more times.) When you do this and replace a bad cell or two, you need to have another power tool battery to cannibalize for 18650s. The 18650s from laptops and modems won't work for replacements. The cells are not strong enough for heavy discharge like a tool battery. Remember a few years ago all the 'hover-boards' that were catching on fire? The problem with those was, the 18650s that had been installed in China were 'laptop' type 18650s and couldn't handle the heavy/rapid discharge cycle from the hover-board. They needed to be built with the high rating 'Tool' batteries but weren't (for whatever reason), and this caused them to catch on fire. I work on all kinds of batteries and most of the batteries being replaced as dead have had one of three issues. (1) The pack was ran completely dead and then not recharged right away, (2) The battery pack was left in the back of a truck and got rain water in it. And (3) For golf-cart and automotive batteries, the water level wasn't checked and maintained... Nice Video! Ya'll Take Care and be safe, John

My Guy !! I ALMOST just bought 2 new Batteries. @90$ each. IT WOULD of been A Waste Of Money!!! I Can't Believe they don't tell you about this. Or sell something SAFER for those NOT Skilled Enough or Afraid to Do This... It WORKED. THANK YOU !!!!

phil thank you very informative got gifted approx from an retired fried of mine battery tools dewalt, hitichi, makita, bosch. all battery powered all had two batteries each except makita that had three not been used for 8 years plus watch your video even though i never had the testing equipment but tried it as i had nothing to loose all tools are functioning thx

Phil AND all the smart people commenting and sharing your knowledge , I thank you !!!

I have this a try with a dead 20v Black and Decker battery. 30 seconds hooked up to another 20v battery and it charged nicely. Thanks for the tip.

Thanks for posting this. I was just able to resuscitate a 12v milwaukee battery that wouldn't charge. Didn't have any alligator clips lying around so I had to carefully use uncoiled paper clips as cables. After 20 minutes it's as good as new! Saved a few bucks and just as good, didn't have to create any unnecessary waste.

Thank you so much for putting this video together I ended up jumping a Black & Decker 18 V that was not showing any type of charge with a 12 V Black & Decker I had and because the prongs were the same it was an easy set up that only took two minutes. I then put it on a charger and the charger read it at that point. Saved me at least $30!!

Very cool 👍 I've got a DeWalt that's been sitting for 5 years with dead batteries, I'm going out to the barn right now and hooking it up to a Ryobi that I have that is perfectly fine, wish me luck 👍☮️

Awesome Hack Phil. Love the input and advice. Stay safe!

Did it with my Dewald 18V XRP, runs like a champ again! Thanks for teaching this hack!

As a matter of safety it's a good idea to also check 5he cells. They may be corroded if they've sat for long periods. Like alkaline batts in things like flashlights. Also better to do this in a large well ventilated area just in case. Meantime Phil , thanks for the informative money saving tips sales staff would never tell us. That is, if they even know.

From one know it all Phil to another great channel just found you and Subscribed! I have done this a few times over the years and it works a treat.

There is something to be said for mains driven tools ...my original Bosch drill , about 38 years old is still 100% functional and with its original brushes..works a treat complete with chuck key.

A really great video instruction! Thanks for this!

Great video with great tips. Thanks for sharing with us.

Thanks for that, this is exactly what we all need to know. there is too much waste due to Commercial practises.

Thanks Bud! I have the same batteries you do so I shouldn't have any problem. The Milwaukee batteries have been sitting in my tool box for at least 15 years now without being charged and when I push the battery check light it gives me three bars. I also have two dead XRPs 18 vdc. This will give me something to fart around with. Thanks!

Mr. Know It All, I Do like the way you check and double check your readings, and tester. 1 wrong move it's over. This was a great tutorial on rejuvinating a dead battery that wont charge. I build 48volt 16ah bike batteries, and I picked up good info.

Awesome, i’ve been holding on to 3 dead ones, including a 250.00 M-18 12.0. Thanks!

Awesome. Going to try this. Thank you.