How to Fix a Dead Rechargeable Battery
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- Опубликовано: 5 окт 2024
- If you ever had a rechargeable battery that quit charging after being neglected for a while, or depleted the battery to the point that it won’t change anymore, don’t throw it away! Instead of replacing the battery, sometimes you can trick the charger to think it is still fine. Rechargeable power tools and other items sometimes indicate a faulty battery if the voltage is too low, but this hack will trick the circuitry into believing it is not faulty after all. Before attempting this on any of your batteries, please research the positive and negative points to attach your wires! Also, rechargeable battery packs aren’t always 4.5v, so add or delete cells as needed to accommodate your application.
Did this hold up? I've got one next to me that doesn't fully charge, and that and another don't even work in the flashlight. Gonna try it anyhow. Thanks for making this. It's guys like you that help a shitload of people in their lifetime.
It worked for a while, but I ended up buying one the other day. Thanks for the compliment, this DID work well on my Android tablet however. Any battery that has been neglected can be awakened.
Radical! I just tried this on a Maglight ML150LR and it’s charging and lit up. I have new batteries out for delivery today but at least I know the light works and I learned a new trick! Thanks!
Glad it worked!
Man you should
Really explain to people the risks involved here. The charger wouldn’t charge the battery because it’s programmed not to if the voltage is below a certain level because with L-ion batteries the cell can become damaged if the voltage dips too low. Damaged cells can explode when trying to charge them. For those of you watching don’t do this inside. Jumping the battery like that can cause a damaged cell to explode.
Some Streamlights have Ni-Cads which vent and do not explode.
Thank you sooo much!!! This method worked on a Promier Products BAT-P1KPP battery (3.7v 3000 mah) using a USB cord to charge the flashlight!!!
No problem! Thanks for the positive feedback.
I used the 6v, 6amp positive and negative sides of my auto battery charger for the battery boost. Worked great! (My flashlight would not do anything before I did that.)
Thanks for your idea!!
🫡
Yeah, this is the same concept with automotive batteries that are too far down, I hook up the charger to a known good battery and daisy chain to the depleted battery and it usually will allow for a full charge as long as the cells are still good
Thank you. Worked for me on two flashlights that I had left on.
Amazing! I’ve actually used this method on old Android tablets to get them to charge again after a year in a drawer.
Thank you, worked with maglight ML150LR
Thank you for the success story!
Well, it bloody well works……!
Overjoyed mate.
Would I lie? Haha, glad you are back in business with the flashlight!
jump start helps
I have a HYPER TOUGH rechargable flashlight without a removeable battery that shows red and flashes green like once a second when charging. The battery has wires attached at both ends that connect to a small circuit board that has the charging port. It registers less than 0.01 volts on my meter.
1) Is it safe to try what you do with the wires attached to the battery?
2) If so, how many seconds should I keep the wires from the 3 C batteries attached to battery in the flashlight to get it's voltage up before I plug the power cord into the charging port?
Many, many thanks!!!
Unsure of your specific application. You have a high probability of kill in the battery for good if you hook it up wrong. I would only put it on the terminal for about 10 seconds. See if you can find polarity, sometimes the charging port will show it.
@@ijfim Thank you for your response!
I know the polarity. There's a red wire on the top of the battery and a black on the bottom. When I connect my multimeter with the red lead to the battery red wire and the black lead to the battery black wire, I get that 0.002 reading. When I reverse the leads of the meter to the battery, it reads -0.002.
It is a 3.7 lithium battery and the charging block that came with it sends 4.79 to the battery to charge it. Is it safe to use 3 C batteries or would it be safer to try connecting 2 C batteries for 5 seconds at a time and then seeing if it has taken enough of a charge for the charger to start charging it? And if not, keep repeating the 5 second charging to the 2 C batteries until it's able to start charging? I just don't need a lithium battery blowing up in my face. That's what I'm afraid of. The flashlight is worthless the way it is so trying your approach might save it. It's a great flashlight and if doing what your video shows saves me from throwing it away, it's a great victory for everyone!
Thank you for your help! :-)
@keepitsimple8 you should be fine with 3 C batteries for short periods of time. Wear eye protection!
The maglite ml 150 batteries are notorious for failing this way and this is great as they are like £80 for a replacement? Great hack?
So it worked to get your light to charge again?
Would you no if a bushnell flash light comes apart and if yiu can change the charging port
Everything was assembled, so everything can be disassembled. If it was pressed together, it makes it more difficult sometimes.
I have a very similar flashlight as you do here and I had to get a new battery today. But anyway what bulb are you using here? Mine is the OEM bulb that came with my light and doesn't seem as bright as yours even with the new battery.
Maybe it’s just the video. My flashlight is the Streamlight Stinger LED “HL.” The HL means, “high lumen.” I have another regular Stinger, but it isn’t that much brighter than that one. Maybe you need to clean the lens?
@@ijfim mine is the Stinger DS Led HP. Not sure what the HP stands for.
HP might stand for “High Projection” or something like that. I was reading the Amazon description from your light and it looks like it’s strength is Projection more than short distance brightness.
Streamlight 75882 Stinger DS C4 LED HP Rechargeable Flashlight - 800 Lumens, Black a.co/d/7rslHU8
How long should a Streamlight 74175 Battery Lithium battery last when the flash light is on?
Mine lasts about 1.5hrs on bright setting. To make it last longer, hold the button down until the light dims twice, your light will last much longer in this setting.
Thank You very for Sharing !!! 😊
I actually did this a while back with the leads off a 9 volt AC adapter. I think the charging voltage is 9.75
Wow, that’s a good idea too. Harder to tell which side is + and which side is - though.
@@ijfim Right. I just verified with the multimeter first.
Also works with cordless tool batteries. Just get a "good" battery and connect it to the "dead" one for a few minutes. Lots of times the "dead" one will charge.
You might also put a fuse on the wire to the positive side of the battery so if there's a dead short it doesn't fry both the batteries.
Note that my layman's explanation is that there is a computer chip in that "dead" battery that isn't running when you connect it to the charger. It requires a small charge to allow the battery to be charged.
Well said!
Your the best thank you 😊
Glad it helped you.
Great video ima tryn fix mine later today
Some are fixed, others have to be replaced. Worth a try though.