For those who don't quite understand, what he is saying is that there is a low level cut-out switch at approximately 4-a5 volts. So If the battery sits too long and drains, which it realistically should not if it's plugged into a tool because the tool has a low level switch to stop draining the battery before it reaches this criteria, the battery has a cut-out switch so it cannot charge. So by going into the battery and bypassing the little brain and directly charging the cells up above the brain cut-out threshold, he tricks the brain by bypassing it and giving the cells enough power to get the brain to open the passage for charging again. This works about 70-90% of the time, but if you have a burned out cell you need to revert to another video. Thanks for your great short video!
The question is, is the fact that the battery got to that state in the first place a sign that the battery and/or cells are going bad and it's going to happen again or more frequently? I just found a couple Ryobi 18v lithium batteries that I had misplaced several years ago. Not thinking they would charge, I put them in the charger and they charged right up. Certainly after several years they would have discharged fully.
Making use of the ru-vid.comUgkxcJ22tnHH9l1vjdIdEIG27iOG55P7LXI8 reconditioning plan, I just saved 2 auto batteries from being completely junked. The guides were very simple to follow. I wish I would have found this years ago! You may use the guide to recondition any battery type
After I watched your video yesterday evening, I had two batteries that would not charge I done exactly like you showed it works flawlessly thank you young man, you made it simple and easy to understand thank you
There's a dozen or more of these videos on RU-vid, and I was happy I went with this one. Cuts to the chase; doesn't require me to hack my Ryobi charger. $15 trickle charger was worth the investment to get three formerly dead Ryobi lithium batteries in play again. Thanks for posting.
A little humor to this is I tried it your way and it worked, so easy your way. The humor or irony is I used my Ryobi impact driver and bits to fix my bad Ryobi battery. So, BIG thanks. Larry
Thank you for the information. I had just bought a Ryobi cordless hedge trimmer from an elderly lady who had used it a couple of times but left the battery in the machine. Dead battery! Tried your method of repair and now its alive and well.
Look at your battery case to see if it offers pos and neg terminal markings. I was able to charge my battery without removing the casing/cover. Worked like a charm... took less than 30secs of holding the clips on the terminals before I plugged it back in to the ryobi charger and it started charging as usual. Thx for the video!
Yeah, I've repeatedly put them on and off the charger to "rejuvenate", sometimes 10+ times before they start charging. Used to have them not charge all the time and would use that trick... but learned to not run them down till they're dead when in the tools and none go bad anymore.
i am a ryobi fan and have 18v plus system batteries for a while and been replacing as they died, i assumed the batteries would no longer hold a charge or take a charge, your video is interesting and i will certainly give it a try, it gets expensive buying new 18v batteries , thank you for the tips
I sometimes try these RU-vid videos to fix things and they very rarely work. However, this time, everything worked perfectly and I know absolutely nothing about electronics! VERY clear instructions and showed me exactly what to do. I have no idea how to actually use a trickle charger or a multimeter but with this video I was able to fix my Ryobi 18 Volt battery and, more importantly, impress my wife with the blinking green light!!! Thanks so much for a great tutorial. I wonder if that process works on other similar batteries too. Keep up the good work. You are the MAN!
Had a Ryobi 18v battery that died and wouldn't charge so I marked it bad and had planned on throwing it away. Before I got around to throwing it away a much newer battery did the same thing. I was thinking I would have to buy a couple of new batteries. I decided to do a search to see if anyone else had the same issue and I came across this video. Being a retired mechanic, I had everything necessary to try this process and it worked great. Took the batteries apart as shown in the video and used a small 12v charger touching the leads to the batter for only 1 minute. Both batteries are now charging great. Thank you for your video!
It was a very good video. But I have two questions, 1 why do you have to take the battery apart, I didn't hear you say you needed to take them apart??? My second question is, can thus be done to a regular Ryobi battery, a no Lithium battery??? Again great video
Great fix! I had a Ryobi 18V 3ah that just went out and you saved me $67! Works great again and I now know to keep a charge on them too. Easy once I had an T10 extention torx bit. Thanks for posting.
Thank you young man I appreciate it I've got two of those batteries that died on me and I didn't know what I was going to do, when I seen the Harbor Freight charger come up the light bulb went off in my head an old dog can learn new tricks thank you son
Worked for my battery !!! I had a battery that I couldn't "fix" by connecting to the visible terminal connectors... So I opened the battery, as shown in the video, and connected the charger directly to the internal batteries (thereby bypassing the electronics) and now, all is good.
this is better than most videos on this platform, but the key problem is that you should have a professional charger like the imax b6ac v2 and attempt to charge each individual cell that makes up the pack to its normal voltage. another thing to keep in mind is that although it might charge to full it could have bad cells which could be contributing to poor life. these individual cells would need to be replaced with ones of the same specs in order to prevent damage. as I said in the beginning this is a much better video than most and should work for many people. I would urge caution to inexperienced people who think that applying voltage is going to solve their problems. I have seen many things that are a safety hazard and many videos don't take safety as a priority. just to let you non electronics savvy people know that it's not so much the voltage that can kill you, but it is the amperage that will do it. most current above 100ma could be lethal! take extreme caution. if you don't feel comfortable, leave it to a professional.
I have a 1.5ah Ryobi battery that only charges to 2 bars instead of 4. Does that mean there's a bad cell needing to be replaced? So, the method shown here wouldn't help? Thanks.
Rather than a trickle charger I simply used another Ryobi 18v battery and connected it with a couple of handheld wires for 30 seconds... bingo, dead battery up to 12v and the charger recognises it instantly. Many thanks :)
Fantastic. I have six (6) P102 batteries that have all went dead. Going to get that charger and bring them back to life. Thanks for saving me much money
Thank you. Good instructions . Nice and short. I tried to use my scooter battery charger and it did not work. Found out that it has safety features which prevented the boost. However I used a 12v random charger and was able to get it going. Now I have a working Ryobi battery.
The terminals at the top are what already read the charge and the circuit board is stopping it from charging in the first place. Bypassing it allows it to charge directly to a battery
Thanks a ton as I'm a heavy Ryobi user , drills , cordless and corded, saw, sheet metal saw , circular, multi tool and just about everything except the blower lol. But seriously I've got 1 battery exactly like the one you demonstrated on and 8 others ,so I'm just going use that hack and get it right back up. 🙏🎯👍
Worked for my Riobi.. I had left town for a few months, coming back to a dead battery .. (so, not overuse).. A quick boost from a working battery (1 minute connected) , and everything is working again.. Thank you.
I had a Ryobi 18 V battery that sat in my garage for over 18 months that would not take a charge. The "Fix" was fast...easy & safe. I used my 12VDC trickle charger ..held the "+" & the "- " cables to the battery posts for slightly over 2 minutes. I then put the battery into the Ryobi battery charger. The charger "Testing" cycle ran a little longer than normal then it started the charging cycle ! I did not do any disassembly ...I didn't drill any holes !
Old tech but worth trying first. Newer LiIon battery packs have active discharge limiters and pinouts that prevent their going flat but don't prevent charging current from passing to the cells.
well done!!! one of my Ryobi 18v just went tits up the other day... $70 replacement at Home Depot is just not in the budget right now.. many thanks for this very informative fix-it video...
Just 2 days ago I "recovered" a dead 24V Li Ion hand chainsaw battery BY freezing it for 14 hour, thawing it for 7 hours and then Taa Daa RECHARGING IT!! (As per information I found on the Inet.) . After thaw, the charger showed GREEN - with a periodic FLICKER OF - RED. Hang on sloopy!! Initially I was disappointed thinking the Inet info was bad [tho told about the red flicker]). I waited about 45 minutes and the LED turned solid RED and began charging 4 hours later solid GREEN charged. It now once again powers my saw As Johnny 5 would say NO DISASSEMBLE! No Multimeter, no strange screwdriver tips, etc!!! TRY this route first. IF IT DONT WORK then do the disassemble route.
Thanks. Worked on PC18BXL (Porter Cable) that had the same type issue. Wouldn't charge. Have 2 units 3ah and 6ah. T10 opens but need a longer one on the 6ah.
Great video. I have four RYOBI "dead" batteries. Your video might just give them a new life. My plan is to use my trickle charger too. It's too bad that RIOBI, and others, don't have a way to prevent this from happening in the first place. But then they won't sell us new batteries thinking ours are trashed. I will be putting this video in my saved video folder.
it's because the bms has no way to determine if the pack just has a dead cell or if one is actually shot, and when they become overly discharged and the individual cells aren't balanced there's always a risk of overheating and fire, that's the real reason why it happens. just take care of you're batteries, keep them out of temperature extremes and keep them charged up but don't over charge them. most people just use their drill once in a while and don't keep their packs charged. hot and cold don't help either.
Holy Cow!!! My "spare" battery has been dead for 4 years, and i thought i had a bad circuit board.... Now working again, thanks to your tip!!! By the way.... I bought one of those driver bit kits from Home Depot, and i use it alot in my electronics shop. I love it!
Lithium batteries (depending on the actual chemistry) do not like to be totally discharged. To maximize battery life, don't let them discharge to zero. The battery packs have safety circuits that shuts the battery down when the battery discharges to a certain point, but the circuit needs a little power, and battery self-discharge keeps happening in the battery. A total discharged Lithium, similar to lead acid, battery will be permanently damaged. This fix by-passes the charge control and battery monitoring circuits and puts enough power back into the battery to power those circuits to enable charging. Good information, but be very careful to watch the battery pack during this process, because it can start a battery fire (don't leave battery pack connected if you leave the room.) Lithium chemistry is much more finicky to charging, and all those electronics in the battery pack and charger are doing a job. Bottom line is to keep Lithium battery packs charged 70-100% while in storage, and throw them on a charger every couple of months to keep them healthy.
First video that explains why the batteries will not charge and how to get it working again . I think that there is a low voltage shut off in the circuit board so that the batterys can only be discharged to a certain precent to protect the batterys , and then if the voltage drops even lower it will not connect to recharge .
Thank you so much, so any 12v battery maintainer can save the pricey battery. Wow, I will get one motormaster 12v 0.8a battery charger and maintainer to try
mic wang Ian just using it to bring the battery voltage up to a level , that way the on board chip can recognize its there. It doesn’t take much. Cheers
Thanks for watching I appreciate it! I’m curious too . my thoughts are they have a really good warranty on them so you are not tempted to break the seal! Can you imagine how many good batteries would be thrown away with out one in place? This is Very Bad environmental issue!
@@ATEMOFFROAD Right now I have four of these batteries that are "defunct". Oneif them useless than six months old but I cant prove it. I will try your method with great hope! If merely bringing the charge above a minimum threshold is all it takes to "repair" them, without some reasoning why this is dangerous, this looks to me like an artificial battery marketing program.
@@GaryBickford the battery you see in this video was less then six months old ! Now it’s still works like a charm and has not had an issue since! It beats having to manually sweep the porch, the ryobi battery is bad not the blower,Hope all goes well , good luck! Be safe and report back 👍🏼
I just tried your solution and it worked! Thanks! But; why take the battery apart? Couldn't the same result be had by simply touching the charger leads to the + and - terminals on the battery?
I had a battery that I couldn't "fix" by connecting to the visible terminal connectors... I opened the battery and connected the charger directly to the internal batteries (bypassing the electronics) and all was good.
Thankyou for this very helpful vid but the 12v trickle charge didn't work for me though here is an alternative for anyone else stuck with the same issue. I have an 18v 5.0Ah pack that was down to 15v preventing any charge so the 12v would obviously be too low of a kick-start where I found a 19v (3.95A) laptop charger and connected it the same way to the neg and pos for 10mins till it got to about 19.5v then put it back together where I used the original charger to maintain it's nominal value of 20.2v.
@@ATEMOFFROAD I really envy you all that upload these helpful vids and I should do some of my own but I usually find what I am looking for and emphasis on that in the comments (hence yours) and give my appraisal.
@@ATEMOFFROAD I was going crazy figuring out every possible way to fix the problem. Since I don’t have the package it came in. Long story short. Reads defective. Appreciate the time taken to do this.
my makita battery pack charged 1 times and with 24hrs the battery had drained. So i took apart the battery pack and recharged all the 18650 individually in a separate charger, 4 out of the 10 were .5v and most where 1.4v, so even the ones with .5v were able to charge up to 4.1v now im letting them sit for 48hrs to see how much they drop and hold a charge.
@ATEMOFFROAD Same here. My Stem reads 0.18 but my flat tabs read over 18V!!! Is there a way to fix this? I took apart two batteries just to test and the stem definitely read different and still cant charge. @davidrinaldis2351
I put mine in the freezer overnight and they almost always start to charge when plugged in. The other thing for really stubborn Li batteries is to take a 9 volt rectangular battery and 2 alligator clips and connect + to Ryobi + and - to -...about 15 seconds later the 9v battery gives the Li battery enough to appear alive and then you can charge. You don't have to disassemble the Ryobi to do either.
excellent video, but i am confused as to the charger that you used. if you could explain further or point me in the direction as to where to find one.... thanks....Semper Fi.
I haven’t read all the comments, but do you think you can do it without taking the battery apart? Meaning hook the trickle charger to the positive and negative leads that would take the charge from the ryobi charger? I wasn’t sure if it was the BMS or the charger causing the issue.
I suspected it was the board and not the charger but some say it has worked the way you mentioned it! Also keep in mind you could have a bad cell , this is another reason why you would want to take it apart! Thanks for watching 🍻
All my new Ryobi tools use a different battery, in that the charger contacts are on the opposite end (and the bottom of) the normal battery insertion port for the tools. How this might effect overcoming a 'dead' battery scenario is a bridge I will cross when I come to it.
To make my 18v battery work all I had to do was take one 9 v battery I took two wires stripped each end taped the Positive to + and Neg to Neg for about 10 minutes then put it on my 18v charger and it will now charge ( no taking apart the battery
I have 10 Ryobi battery's all different sizes from the smallest 18v to the 5 ah and all of them quit working.u know that's a lot of money to replace all of them
An 18V lithium pack has either 4 or 5 lithium cells in series. If you had only 4V from the pack, that makes 1V per cell average. When lithium cells are discharged below about 3V PER CELL, the cell is damaged PERMANENTLY. That’s why the charger refuses to charge it. Over discharged lithium batteries are DANGEROUS. They have a high propensity for “bloating” and/or catching fire when subsequently recharged. IF you choose to do this, NEVER bring the battery into your house/garage again. Charge and store it outside.
Older , worn out batteries should be recycled and replaced. Not repaired. The battery in the video was fairly new just a few uses. This is a known problem with the ryobi line of batteries. I still use this same battery on the same blower once or twice a week, every week since I have made this video no problems and still charges. I have noticed some degradation. 🍻
