Six ways to "Wake Up" your dead 12v Lifepo4 Battery!
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- เผยแพร่เมื่อ 7 ก.ย. 2024
- Have you ever accidentally discharged your 12v lifepo4 battery to the point where it shuts off and you can't charge it?
In this video I show you six ways to "Wake Up" your 12v Lifepo4 battery after it shuts down after being completely discharged. I can't believe the last method actually worked!!
Items used in this video:
Ampere Time 12V 50Ah Lithium LiFePO4 Battery, Built-in 50A BMS, 4000-15000 Deep Cycles Lithium Iron Phosphate, Perfect for Bass Boats, Trolling Motors, Floor Sweepers, RV, Solar, etc.
amzn.to/3Xe130t
UNOWIX LiFePO4 Deep Cycle Lithium Battery
amzn.to/3CO2CKU
Official UNOWIX website:
unowix.com/uno...
Haisito 20 Amp Lithium Battery Charger, 12V and 24V Lifepo4,Lead-Acid(AGM/Gel/SLA..) Battery Charger ,Battery Maintainer, Trickle Charger, and Battery Desulfator for Car ,Boat,Motorcycle, Lawn Mower
amzn.to/3T08pmY
Aorika 2-Bank Automatic Smart Charger, 12V/10A 24V/5A Dual Automotive Car Battery Charger with LED Display, Battery Maintainer, Float Charger, Trickle Charger for Lead-Acid, Lithium, LiFePo4 Battery
amzn.to/3Gnw8I0
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That was a fascinating demonstration. It's probably better not to let a battery get completely depleted, but it's good to know there are so many options to wake it up. Very interesting. Video. Thank you.
Glad you enjoyed it. That poor battery got beat up during the video, but it charged up to 50amps afterward! Thanks for the comment!
Mine was 100% depleted by just trying to start my Motoycycle, super weird..
Today I learned that my battery has a BMS. Didn't even know that was a thing! My inverter powered off last night and wouldn't turn back on. I live in SA and we have been without power for 3 days now. The lack of power finally killed everything. Watched your vid, took the battery outside and touched it on the car battery and BAZINGA! I'm back in the game! Thanks for this man!
Glad it helped! Good luck and thanks for the comment.
Thanks for this. I have a couple of $2,000 paperweights in my garage that I tried to revive with a trickle charger with no success. Now I’m thinking (hoping) that I wasn’t getting 12 volts from the charger. So glad I came across your video!
You're welcome! I hope it helped. Thanks for the comment.
Good ideas for those who didn't know. Should be helpful to many who find it
Thank you. If it helps one person, I'll be happy!
Great Video. All the modern Solar Charge Controllers have the wake up function also.
Darn, I didn't think of that! Thanks for the info.
But not all use cases include solar charge controllers
Thanks, drained my Lithium in my RV, oops. The first tip worked. Thanks again, I was stressed.
Glad it helped! Thanks for the comment.
Absolutely Bravo!! I really liked the string of C batteries trick!! Well done Sir!!
Thanks! I really tried to think of different ways that aren't common. Thanks for the comment!
Thanks. The lithium ion battery charger I was using would not kick in until it sensed 4V. The battery was reading 2.4V as the BMS needed a wake up call. I ended up using an older battery charger that sparks when you touch leads together. This was enough to wake up the battery. It is charging now thanks to your tips. Hopefully this is why my 2017 Mercedes S550 would not start.
I'm glad you got some information from the video. I don't know about the Mercedes.... 😉. Thanks for the comment.
This post was a life saver.....learnt so much. MANY THANKS!!!
Glad it helped! Thanks for the comment.
Nice video and may i add if you take 120v extension cord with the Other ends bare it kick starts it fast. Note just 2 seconds is sll it takes
Thanks for the info and the comment!
Great video - unfortunately I have a EarthX battery complete dead with 4,6V - and fault indicator - and I could not wake it up with another 12V battery. Voltage goes up to 12V momentarily but falls again to 4,6V... guess the battery is toast.
Bummer. Sounds like something in the BMS is no working properly. I would be careful on trying to charge that battery. It might not know when to stop and cause thermal runaway. That would be worse case scenario. Thanks for the comment.
Thanks for the video. I am off to the store to see if a 23a 12v battery will work. Might just keep. Few of these on the road with me just in case.
Make sure to make note of what you want to power. Small battery for a small load.
i am extremely grateful for your video with demo ... many many many thanks !!! and merry Christmas
Thank you very much! I hope the video helped in some way.
This happened to me yesterday morning. I ordered the 20 Amp charger:)
The charger will work well for you. Thanks for the comment.
My LiFePo4 sleeps after non-use for a period of time in addition to low cell voltage. I constantly need to check the voltage before I take it into the field for use. I need a hand crank "waker" or perhaps a big capacitor to keep in my field kit. Thanks for the video.
I've never heard of a battery that turns off the BMS when not in use for an extended amount of time. What is the brand of the battery?
This one is a Chins. Maybe the shelf drain is worse than I thought. I used to do FW/HW work for a US company that sells consumer Bluetooth headphones, buds, speakers, etc and we would sleep them after 30 days. You would then need to plug USB in to wake them.
I bought 2 more batteries and will take one of them and shelf it for a couple of months and see what happens.
thx ! never thought about jump starting using my motorcycle battery appreciate the info
Glad I could help! Thanks for the comment.
Another Awesome Teaching Video .
Very Detailed and Easy to Understand 😃
Thank You 👍
You're very welcome! Thanks for watching.
This is bullshit, none of them work
Very nice video with a lot of good ideas. I accidently did this very thing but I touched the terminals of the charge controller trying to wake it up after my batteries went to sleep. It was risky, but hey I was desperate since I'd only had the batteries 3 days. Then I found your video! It confirmed for me that it was ok to do that and now I know the proper way to do it. Also, couldn't you use one of the batteries from your cordless power tools?
I'm glad it worked out for you! I believe I could, but I feel 18v is on the very high end. I'd rather give examples of voltage closer to 14v. Thanks for the comment.
My HTRC 30 amp "smart" charger wasn't able to wake up the battery. Thankfully from videos like this I knew I could "jump start", but it was cold and dark so I didn't want to drag my battery out to the driveway. Thankfully I have a "dumb" 12 volt power supply and was able to use that. I've heard that 9 volts may be enough to tell the charger to go ahead and start, so I'm going to try a simple 9-volt battery next time.
Glad the video helped. I've never thought of using a small 9v battery. Thanks for the comment.
Great 👍 thanks 🙏🏻
So many options to use and choose from.
Glad it was helpful! Thanks for the comment.
I got that same Hashito charger watching your channel, glad to know it has that built in function. I'm now starting to use LiFepo4 batteries, but I haven't allowed them to drain down really low yet. I'm still "testing the waters." From what I'm I've picked up so far, you want to keep your batteries
from going below the 10-20% level. Otherwise, it shortens the battery's life span. Is this true?
But probably, it's unavoidable,
killing your batteries will happen to everybody at some point.
Glad to see you have the 20amp charger. I think it works well. I believe you will get fewer charge cycles, but you will still get thousands.
I have three 12v 100ah lifpo4 batteries in parallel in my 2000w off grid solar electric system. This system has been running flawlessly for five years . I have two epever solar controllers, one for each solar panel bank. I also have two dedicated lifepo4 battery chargers in case I need to charge the batteries up because of low solar conditions. Again five years without a hiccup. Very rarely could I not easily run overnight the various appliances and lighting that I have plugged into the off grid system. Now, this system won't run overnight without the inverter shutting down for low voltage. I checked the whole system out and the only problem I found is one of the three identical batteries isn't working and when separated from the system shows no voltage. The other two batteries in parallel are fine. The bad battery has been getting the same voltage constantly from the system and the other two batteries in parallel with it. I've isolated the bad battery and tried every trick in the book to wake it up to no avail. Any suggestions?
Sounds like a bad BMS or possibly a bad cell. Either way I believe it's bad. If you felt comfortable about tearing it open you could find out more by measuring each cell. If it only measures at something like 8-9v then you probably have a bad cell.
Do you have a 12v D.C. adapter for a router or modem? You can also try a 9v battery all by itself, but usually you need about 10v to 11v to do the wake up - something higher than the internal shut off voltage.
Thanks for the info.
if there was a BMS cutoff you would have 0 volts..when applying a float a good bms should do a auto trickle load
You're right. Appling a 13v float charge should wake up the BMS just fine. As long as the item you're using to charge doesn't care if there is a voltage at the source, it will work. Thanks for the info and the comment.
Very, very, very helpful. Thank you.
Glad it was helpful! Thanks for the comment.
Good information! Not a flattering picture over your laptop lol
😅 thanks!
THIS!!! The Best video, thank you!
Glad you liked it! Thanks for the comment.
AWESOME thank you so much for making thos video! Will sealed lead acid batteries react the same way as a lithium??
And same concept - if waking up a 6v use roughly 6 volts to accomplish this?
I don't believe so since SLA batteries don't have a battery management system. If you have a 6v battery with a BMS I'm sure you would need a 6v source to wake it up. Thanks for the comment.
This has puzzled me for a while... Modern charge controllers should have a feature that would enable "Lifepo LFP" BMS with a pulse wake up voltage. Would be. A simple addition.
I just found a HQST charge controller that does just that. It also has low temp protection in case you need it and your battery isn't equipped. Thanks for the comment.
alot of new chargers don't output unless they see power from a battery. alot of solar controllers have wake up functions for lithium setups too.
Thanks for the info and the comment.
What ends did you post to the battery in series? ...Also, thought it was okay and actually best to fully deplete lithium then recharge, but only 50% for lead acid battery... any clarity on why not? Thought that was a key benefit for lithium ...
That is a big benefit. Most solar charger controllers and LFP chargers can wake up a battery. Running the battery from 100 to 0% will still give you 1000's of cycles. I don't know if this helps...
@@OffGridBasement Thank you. It does help. After watching a few more vids , I see some suggesting not to go below 20% on Lithium so not sure if it's to avoid having the wake up issue or if it preserves battery life, but I'll keep both in mind.
Would be interesting to see how low of a voltage you could use on that bench top power supply to wake it up.. I wonder if maybe even a 9 volt battery might work..
I believe the voltage has to be .5v higher than the minimum voltage of the battery. So if the BMS shuts off @ 10.5v you would need an 11v source to wake it back up. That's what I've heard, but I haven't tested it.
Why didn't the depleted battery fall back to 1.3V when the rescue battery source was removed? Then it won't be recharged, right?
The cells inside the battery and had time rise back up in voltage. When the BMS is back on, it stays on because the cells are in a voltage range that the BMS measures as safe. Hope that helps!
interesting video... I thought you were going to pull out one of you drill batteries and try that.. Now im curious
The drill batteries are all 18v. I'm not sure what would happen if I shocked it with that high of a voltage. I don't want to destroy the BMS.
@Off Grid Basement no don't try it with an 18v, I thought you might would have had a 12v lying around from an old drill.
Great video. All kinds of good info.
Glad it was helpful! Thanks for the comment.
In looking up the Hasidic charge, I see that it gives you the option of lithium or LifePO4. How do you tell the difference??
I'm not sure. They both have the same voltage range per cell. I don't know what Hasidic charge is.
@@OffGridBasement LOL….I don’t know what Hasidic charge is either, but I guess prescriptive text knows. Meanwhile, I’ve pulled the battery out of my generator, but when attaching it to my jump starter, I can only get about 6v from it, and the voltage drops right away. I think the battery must be bad.
You can use a solar panel without the charge controller too.
As long as the voltage of the panel isn't too high. I didn't think of that one. Thanks for the info and the comment.
What do you do when the battery still shows 0 Volts after "boosting" it with another 12V?
The voltage shouldn't be 0v. It should be around 1.5v for a powered down lifepo4 battery. You might have an internal wiring issue or the BMS is shot. Sorry I can't be more help.
Would a 9v battery kick it off, or do you need greater than 10.9v?
I've never tried it but I don't think it will work. I believe it needs to be at least 10.5v, but I'm not certain. I do know the BMS shuts down when it gets below 10v. Thanks for the question.
This is cool! Thanks for sharing.
Thanks for watching!
Hi. Pls advise what to do if battery shows 0 v. (Ultimatron 25.6v lifepo4). No rection at all.
If it shows 0v then the BMS isn't shut down. it's probably cooked.
@@OffGridBasement any chance to revive.
How can i wake up my dead battery 36v li-ion battery 1850 e-step ? Thx
Did it not come with its own charger? If not, then you would need another 36v source. 3 car batteries wired in series... a variable power supply would work. Even wiring four 9v energizer batteries in series would do the trick. Hope this helps. Good luck...
Great stuff! Thanks
You're welcome! Thanks for the comment.
Question: If I don't have a spare 24v server rack battery to jumpstart it, what could I use to accomplish this?
Anything that adds up to 24v. Two car batteries in series or three 9v batteries in series. I believe those examples would work. Thanks for the comment!
I bought an electric start generator where the instructions indicate to disconnect the battery for ‘long storage’. I didn’t disconnect it and when I went to start the generator after about 3 months, the battery voltage was somewhat less than 4v, the electric start wouldn’t work and my (cheap) battery charger/maintainer, which supposedly ‘recognizes’ whether the battery is lithium or lead acid, would not charge it. When you are jumping the battery in the video and it now indicates 10 volts, are you just waking up the BMS, or would the electric start in the generator now actually work? And if just waking up the BMS, how long do you have to hook up your charger before the voltage drops again?
As long as the battery is being drained when you wake it up it should stay awake for a while. You just want to wake it up with a jump from another battery. Use a proper charger to charge.
Thank you you saved my battery
You're welcome!
MY LIFEPO WAS AT 0ish,,, I did the battery parallel trick,, it read 12.54,, but my charger (NOCO) still won't charge it... left it overnight did not get past 12.54 volts ??? any ideas ?
How fast is the NOCO charger? A 3A charger would take over 30 hours to charge a 100ah battery.
@@OffGridBasement its a 10 amp charger,,, I have left overnight, LEDS bounce between first and second bar all night. I have multimetered it and got a ready of 12.54 always,,, I but a battery load tester on it and have gotten a reading of 5.6 volts.. I have connected an RC charger to it that supports LiFePO and the charger does not recognize the battery.
Awesome
Hello with this haisito 20A charger can i charge at max somedays the battery if there is no solar charge like Rain ...claudy day?i am interested to buy this charger
Yes. I've watched the charger push 19 amps. I believe it will work well for you.
great video, thanks!!
You're welcome!
Good Video. 👍
Thanks 👍
I’ve got a new battery that sat too long outside before checking and it was getting rained on. Voltage at .65 and jumping with another battery didn’t do it. Do you think a charger like you showed work?
Not sure. BMS might be dead. If the other battery had 12v then there might be a problem.
Ok, 1 9volt battery not likely. So click 2 together. What happens? Too high voltage, I get that, but for the brief moment of contact would it hurt anything?
That's a good question. I'm not sure how fast the high voltage disconnect takes effect. If only connected for a second I bet it would work.
9 volt batteries can't supply much current, so the low resistance of the lifepo4 battery will most likely pull the 18v battery (high ESR - equivalent series resistance) down to like 10v.
Thanks
Welcome. Thanks for the comment.
Mine registers 0 but charges fine. But isn't the bms supposed to shut down at 8 to 10 volts
Yes. Most are 10v when they shut down. If it's 0v you might have a problem.
I tried all like you - it doesn't work, I have 2 new batteries with bluetooth - they went dead and nothing of your advice works - the batteries were never fully charged since I was waiting for solar components ... now what should I do?
Does the Bluetooth connect? What is the voltage right now? Do you have a charger that will wake up a lifepo4 battery? Are they connected to a system? If so, disconnect and try again. Let me know.
I tried using a battery, seems like voltage too low and needs charged. Was delivered with 4.4 volts. If noneof these work does that mean dead bms? Time usb 100 ah battery
Yes. There is something wrong with the cells or the BMS. 4.4v is an odd voltage for a 12v battery. You need to send it back.
I have a bran new battery that has the output meter on it. It reads 13.3 v and 93% out of the box. Problem is when I hook up anything to it it will not work. In other words I’ve never used the battery because it will not put out any power from day 1.
That is very odd. What all have you connected to it? I've never encountered a battery that shows voltage but doesn't produce any power. Might want to check the voltage at the battery posts to confirm that it's 13.3v. Good luck and thanks for the comment.
@@OffGridBasement actually I did check it at the post and it read 8v. I hooked up an LED light and it was very dim. Then I took the same light and hooked it to another batter and it shined bright. When I try and charge it the charger reads off but the indicator constantly flashes with the symbol empty.
@@larrybrevelleunfortunately you either have a bad cell or a bad bms connection in the battery. You should probably send it back.
@@OffGridBasement thank you. The return is already in motion.
would you also be able to detach the BMS and re attach it?
I honestly don't know if that would work. I'm not sure if the BMS would keep the setting of the low voltage or completely clear out to factory default settings.
Nice! Thank you!
You're welcome and thanks for the comment.
@@OffGridBasement So I checked voltage on both of my Dragonfly lithium batteries in my 2023 Keystone Bullet. Voltage for each battery was 13.57. I made sure they weren't connected as well. I'm stumped because I don't know what could have woken up the batteries. I'm gonna call Dragonfly tomorrow. Thanks again.
Can you use solar?
Yes! Most solar charger controllers will wake a BMS. Also, I've heard you can directly connect a 12v panel to get the job done. Thanks for the comment.
i wonder if 12v is going to revive a 52v battery? or do i need to hit it with another 52v source
You need a source of the same voltage. Thanks for the question and comment.
i tried all of you metheod, my 12v Lifepo4 Battery stll dead. it will not charge
That's not good. Maybe one of the sensors tripped and is now stuck.
Same for me none of those methods work only one I found to work is to open up the battery disconnect the bms negative then hook up a charger till 12v or untill the bms resets
Thanks!
Thank you very much!
I have 48volts lithium iron phosphate. What can I use?
You will need another 48v source. You can combine 4 12v batteries in series. Amperage doesn't matter. Maybe even 6- 9v batteries in series. Hope this helps.
Ok on the water in my boat I have a 24 volt 100 amp lithium battery and it is in sleep mode how do i wake it up and what would i need to keep in the boat if this happens?
You need another 24v source. You really need to plan ahead just incase that happens. if you have a solar panel that's around 24v that might work. You also might want to buy two small 12v batteries to keep so you can connect them in series to wake up the bms in your main battery. Hope this helps.
@@OffGridBasement u think 2 12 volt motorcycle batteries in series work?
@@OffGridBasementdo you have to have a big battery or can you make up 3- 9 volt batteries in series?
@@walleye56789 3 - 9v batteries would do the trick.
@@walleye56789 that would definitely work.
Subscribed
Thank you and thanks for the comment!
Super to know
Glad you got some info from it. Thanks for the comment.
Will 12v wake up a 24v system?
No. You would need another 24v source to wake up a 24v battery BMS
I need to do this for 2 sleeping battle born lithium batteries. They won't charge at all. Can I pull my jeep close to my trailer and hook my jumper cables to the dead lithium battery and then touch my jeep's battery?
If so jeep off? Also the two 2 battle born batteries are linked together. Do I do each one or will they both wake up, when I do one?
I know a multimeter will tell me probably right?
I would disconnect the batteries completely, then you could use your jeep battery to wake them back up separately. Remember to touch them for just a second. That's all it should take. After that, connect them to a 12v charger.
Doesn't work on noco lithium batteries...
That makes sense. I've read that NOCO batteries are auto enabled so no BMS reset is required. Thanks for the info and the comment.
This keeps happening with my battery. I can get 10-12 starts on it, then it acts like it's completely dead. Jumpstart it (with another 12v source) and its fine for another 10-12 starts. Scratching my head here...
What are you starting with a lifepo4 battery?
@@OffGridBasement It's on my Harley.
Jump your battery with one of the same voltage, then start your battery charger.
Thanks for the info and the comment.
How would you wake up a 48V LiFeP04?
I've had to wake up my 48v pack by connecting four 12v batteries in series. Then just touching the terminals will do the trick. I think you need at least 50 volts.
be interesting to try on other BMS voltages @@OffGridBasement
appreciate your rely@@OffGridBasement
Video way too long for the simple material presented. Waste of time. Edit it down to a couple of minutes and you’ll be alright. This is the first and last video of yours I’m watching. Hope the feedback helps you.
I appreciate your honesty and thanks for the comment.
Is there any hope to get a 2 year old stored lifepo4 or is it dead for good?
I wish I could tell you. Even if it does turn back on, the capacity will probably be garbage. Thanks for the comment.
Worth a go. Any luck?