Worked perfectly 👍🏻 Thank you.

This battery reconditioning program exceeded my presumptions. It worked on any drill battery, several AA and AAA batteries batery.repair and any camera battery. The steps are simple and the act itself is exciting to do. No matter what type of battery you`ve got, it is sure to function again!

Protip for those whose only two 18V batteries were BOTH dead after long storage: get two 9 volt batteries (still $5 for the pair at Wally world). Strip some wires to run a loop around the positive (male) terminal of one and negative (female) terminal of the other, then cover those terminals with some gorilla/electrical/etc tape to keep the loops in place). Then connect the two batteries in series (for 18V) by plugging them into each other, and use the leads charge the DeWalt batteries for 60 seconds. The positive terminal on the Dewalts is the one closer to the center of the battery. I had a portable drill tire hole patch that I couldn't do all day because neither battery would charge (quick flashing). I ultimately just carried the tire/wheel up to my apartment to use a corded drlll. Two 9V in series solved my problem, and as I literally own nothing else that runs on 9V batteries, those 9Vs are both going into the drill + charger's case just in case this ever happens again. I can accept batteries for tools only have ~500 use cycles, I can't accept that I only got 4-5 use cycles out of them in 10 years. And replacements for discontinued batteries/tools are just ridiculously overpriced.

Fantastic! I brought two Dewalt 18 volt batteties back life! Thank You so much for sharing your technique!

Awesome video!! To think that I threw away 2 batteries before I saw this video. Thanks for sharing!!

Thank you Tim. I've always thought there was something other that could be done than throwing the battery away !! You're an angel. God bless !! Sincerely ............................ Steph

restoration videos are always awesome

I have two 18V Dewalt batteries that wouldn't take a charge and would flash "replace pack" on the charger. I took my two good batteries, made sure they were fully charged, and did this process. I went ahead and connected everything up with connectors on the wire ends except for the last connection. Both batteries started at around 2.4 V. It's amazing in just a few cycles how quickly they get up to 14+ V. Brought both batteries to just over 20V and then put them on the charger. When I checked back in 30 minutes, the charger indicated full charge. When I took them off the charger and put them in a tool, they worked fine. I can't say if they will last as long or not, but it's better than they were.

DON'T try to revive a lithium battery this way; you might be setting off a firebomb instead. Lithium battery chargers are programmed to reject batteries that have been discharged below 3.2 V/cell because of a risk of overheating If you've run a lithium battery down too far and the charger rejects it, you can try to slow charge it to 3.2 V per cell, then try putting it back on the standard charger. To slow charge, you need a power supply that can put out at least 3.2 Volts times the number of cells in the battery, but not more than 4.2 Volts times that number. For an 18 V lithium pack, that is 5 cells (3.6 V nominal x 5 = 18 V), so the range is 16 V to 20 V. Suppose you have discharged your battery to 14 Volts and it gets rejected by the charger. For a typical power tool battery, a safe slow charge rate may be about 100 mA, so (20V - 14V)/ 0.100A = 60 Ohms. 6 V * 0.1 A = 0.6 W, so you would need a 60 Ohm, 1 Watt resistor between the power supply and the battery. This current will decrease as the battery charges, so you can recalculate the resistor and replace with a smaller one to speed things up. Alternatively, you can use a 12 V incandescent instrument panel lamp instead (two in series if the difference between nominal voltage and measured voltage is more than 12 V), but monitor the battery very closely for hot spots or general overheating, especially during the first 20 minutes. Keep checking the battery voltage at least once an hour. If it stops increasing before it gets above 16.8 Volts, the battery may not be salvageable..

Worked for me! Fixed 4, 18v batteries! Thanks.

Hi Tim, I gave a charge blow to my Dewalt 18v batteries using a Bosch 18v lithium battery and I can recharge them. thanks for your video

This works great. Don't even need to get them to a high voltage. Charger started working after I got mine up to 9v or so.

Nice work friend!!! I'm going to try this out tomorrow on my battery graveyard :)..............(next day) IT WORKS

My case is like this: one battery is 19.0 V dc. The other is roughly (after charge) only 9.2 V dc. I have a 24 V dc power source from another equipment; in theory (and I have not tried it yet), it means I can 'prop' its voltage up to close to nominal 20 V dc by "touch-and-go" its tips, and then, charge it up with the Charger. The electrical 'pressure' will be there, but not its 'current' or 'electrical size'. I have to try it; I have no money to spend in another battery!! Damn DeWalt! I get it; thanks a lot.

Really helped me out thanks man

Sounds good but I don't think they won't have a very long run time on them.

Great job

Always check builders skips for power tool batteries.

Awesome! Easy fix!

It works. Thank you thank you.

So every time you want to charge the battery you have to do this?

Thanks for this!

Dont know how i got here but im glad im here now Where can i find those connector wires your using for the batteries?

That tricks the charger into charging the bad battery, but it will still discharge way sooner. If it is shot, it is shot.

Were those NiCd batteries? Will the same procedure work on Li-Ion batteries or Ni-MH?

Hi, my nickel dewalt 18v batteries are both exhausted, can i charge them with 2 bosch lithium 18v batteries?

Just wondering if you have to do this after charge battery once or twice or will it hold a charge for many more times of charging

It’ll be called arc welding!

I went to RIDGED tools. Free battery replacement for life. I’m done spending $110 for one 18Volt Dewalt battery. Such a rip-off.

That was cool! Thanks my battery just started low charging with blinky light!.. ima try this thank you!!!!

Will this work for the older Li-ion compact ones?

Is there a way to do it if I only own 2 batteries. (I have one functional and one not functional)

I have changed my 18 volt battery to the lithium upgraded 18 volt battery’s and they work much better than the battery’s that comes with the drill. You do have to change the changer but I found a deal on Amazon where you got a charger and battery for a good price.

DO NOT OVER VOLTAGE A LION BATTERY. The Lion batteries if over or under voltage can over heat and get very hot. What this channel is using is nickel metal hydride battery, which is older technology.

Could I use a 48v max dc power supply to accomplish this?

Nice Informationnn

If anyone has a DeWalt DW9116 charger and a digital multimeter take your leads from the tester and insert them into the charger directly on the terminals and please let me know what the max voltage output is. I cant get DeWalt customer support to support. They give as much support as a pair of boxer shorts.

Awesome thank you

Thanks

I have 5 batteries and only 1 good one...can I use a 12v deep cycle?two 12v deepncycles??

I have 18 volts batteries and they charge but only works for 10 minutes

I picked up two 6.0Ah lithium ion replacement batteries for my 18v tools for $72, and a charger for $24. Made by Powilling and sold on Amazon.

how long does it last?

Very nice tyvm

sorry an explosion sound, not a explosion mode

what's the charger model you're using to charge them at the end of the video, mate, pls?

Why didn't you check the batteries when they came off the charger to see what voltage they read?

I have two working dewalt 18 volt batteries like the ones in ur video. I also have two 12 dewalt batteries that their charger has stopped charging. My question is, can I wire together the 18 volt batteries like you’ve done, and the use them to get the 12 volt batteries to revive?

works thanks

Cool , ive always found these batterys ratshit an play up a lot

When you run the newly revived battery down, do you have to do the same thing again or will it now charge fine in a charger?

Or just rebuild them... new batteries BATTERIES ➕ 😂

www.drillbattery.com.au has a large selection of cordless drill batteries from Bosch Batteries, Dewalt drill batteries, Makita tool battery, Milwaukee battery, Black & Decker batteries, Ryobi drill battery, Paslode battery, Dyson batteries power tool manufacturers.

Thanks for the video and sharing this technique...It helps but is likely short lived and this doesn’t work all the time. Might be best to start converting to 20 volt system and use a DeWalt 18-20 volt battery adapter. Then you don’t have to buy new tools. Just my thoughts

Great tip. They want $100 ea brand new...😳 Thank you!!

I use to zap the nickel metal hydride batteries on each dead cell taking the battery apart. The problem is that it doesn't last long. The best way is to buy all new sub-C cells and solder them all together to make the cells into a battery. eBay is a good source, but most of them do not have true Amp Ratings. False advertising.

Hi Tim, instead of buying new 18V dewalt batteries to restore the old dead ones, can I just series 3 new working 12V car batteries and still do the trick?

This is awesome! Thx man! Saved me some $$$$$!!! 😊👍

does this work on batteries that won't hold a charge for longer than a couple of days?

Does it have to be to of the same batteries or just something with more volt's? For example If i have 2 12v batteries in series, would that work on an 18v or a 7.2v? Thanks

When are you going to put out some new videos?

Your tip works to fool the charger into charging a dead battery but you still have at least one dead NiMH 1.2V cell inside that battery. If you have two of those of dead batteries of the same AH rating, then why not open them up and make one good battery with the good cells remaining? Each on of those 18V batteries contains 15 1.2V NiMH cells inside.

Ok, so now for the facts, yes this does work, but you will get varying results, if the cells are to far gone it won’t hold the charge or be as good as it was new, if your battery has been left uncharged for to long or stood unused for a while it might just be a memory issue and this will reset it and the battery “may” be as good as new after, it’s worth a try, but be careful, little touches at a time, if you have a lower voltage battery you can do the same with just one higher voltage battery but don’t take beyond its capacity ie don’t take a 12v battery beyond 12.5v you need a meter to do this successfully without risk, be warned get it wrong and your battery could in theory explode. Cheap batteries from China are poor quality and a waste of money, I understand manufacturers are all looking at exchange battery projects to reduce the cost and carbon footprint to replace them but this could still be years away!

OK... I don't understand batteries... SO.... how and why does this work? Thanks

I tried but the battery explode by making an explosion mode, do you know what happen, no injuries

Now, how long after you did it this time did the batteries hold up? According to this theory, one would never need to buy batteries again...

l used in this but l can not revive my battery.

Workked

It doesn’t work all the time. The main fault is caused by one or two individual cells. So I’ve decided to zap each cell. Again, sometimes it works, sometimes it doesn’t. Tried it on DeWalt, Elu and Makita battery packs.

Doing that will last for a while But the battery won't perform like new. Better off to get a newone.

Lest go to viral

Do ya think you could turn off the space heater just long enough to make your Vid?

Can't see the battery plus or minus

Does it have to be 2:1 voltage?

Just buy the Adapter to use the new Lithium ion batteries with the old dewalt tools dont waste your time with these old batteries they suck compared to the new ones

Yeah, but actual stored electro-chemical energy is still diminished. Voltage is nothing when the storage capacity will not last like a new battery pack.

What kind of vise is that just wondering looks like my grandpas 5 in Olympia vise 1996

But are those nickel battery packs, right? Does it work with lithium batteries too?

Here's the real deal on the "reviving the old battery" trick. Yes, you can get the battery to charge once you jump it with a bit of current. But, if the battery is more than 5 years old, it won't hold a charge for more than a day. It will work when it first comes off the charger, but it won't work the next day.

These bad batteries are only getting what is called a top charge. If you get lucky they may be usable.

So why can't you just use a car battery charger with a jumper start for this? It will jump my truck when it's 20 below o. Why do I need 2 batteries to fix 1 ? Not Bashing you, I'm just asking. Thank you.

When I check my bad battery that causes the charger to quick flash, it has 20 volts, the same as my good battery. The bad battery does not power the drill at all, the good one does. Bother have the same voltage measured separately. I don't have a 3rd battery to try this trick. Any suggestions?

Get an energy up battery

Has this happened to you? I had these old batteries stored in my garage and my wife's junk drawer and I thought they were garbage. But my neighbor told me about this new battery reconditioning system and to my surprise, I was able to make them work again. Not just for my car batteries but also my AA, AAA, C, and D batteries, my drill and my laptop battery. Don't take my word for it, go ahead and try it yourself! *efficial. xyz*