Fixing a dead battery that won’t charge #shoptips #shophacks #batteries #batteryhacks

[chadbradleyracing]

Lithium cells are damaged when they go below 3v. It’s a safety function of the charger to not allow a charge. There’s a chance now that forcing a charge will cause a volatile fire in your home doing this

[Plexico]

Need to add a low voltage disconnect to the car. It’ll disconnect the battery once it gets so low. It’ll make it much safe and make the batteries last much longer.

[qno-ojpy]

LiIon Cell spec says when cell voltage is below 3V you should trickle charger until voltage is above 3V. Else it will damage the cell.

[SpilledMilk]

I just got a brand new tool and I thought the battery was junk about to return it and try this little trick and it worked. Thank you. Saved me a trip from returning the tool. Thank you again.

[henrypaulperalta]

Those batteries rubbing their hands together at the sight of all that wood in the shed 🔥

[jdsstegman]

Don't leave it unattended after! Been doing this for years on lipo, life, and lion battery's. Yes it works. But when it doesn't, they can puff and catch on fire. So be aware. I have had it happen many times. It's worth a try at the cost of these batteries.

Best solution is to have a BMS wired into the 4 wheeler to never allow the battery to be fully drained.

[virtone]

Avoid buying things that don't have "low battery cutoff". If they omit 50 cents of extra electronics to protect $60 batteries, they're not in the business of selling accessories, they're in the business of selling replacement BATTERIES.

[kevinmcgann]

Just saw your video and tried it on a pair of Milwaukee 18v battery's that were brand new and would flash red and green and would not charge, this trick Ty for sharing

[KeithOlson]

Better idea: put a normally-open leaf switch under the seat so the battery will only connect when someone is sitting in the car.

[TheSeanUhTron]

For anyone who's wondering: Battery chargers usually won't try to charge up a battery if the voltage is too low. What this trick does is temporarily bump up the battery voltage so the charger recognizes it as a good battery.

Now... The reason they don't charge up batteries with low voltages is because it's dangerous. It puts a lot of stress on the battery and can cause them to overheat.

Best practice is to never use batteries without a BMS. These will prevent under and overvoltage situations so you never need to do this trick to your batteries.

[jean-thierryaleman]

Dude… I had this exact problem and the jump start method worked perfectly. Thank you!!
And to all those that think the battery just wasn’t pushed in all the way, it was.

[thatairplaneguy]

1) it does work
2) it doesn’t matter that it works because once a lithium cell drops below 3.2v the damage is done and it will never recover. It will charge but not fully and won’t hold it or deliver the current it used to. It will get worse until it’s completely useless
3) forcing a lithium cell to charge could cause it to catch fire, even later on the normal charger

I know they’re expensive but I’m a battery technician by profession and once they’ve been discharged too much it’s best to leave them completely dead and dispose of them. What little life you can regain from this isn’t worth the risk of a fire.

[wolfrainexxx]

Pretty sure there's a Firefighter and Electrical Engineer having an aneurysm watching this.

[tommymadux]

Be careful doing this. If there is a bad lithium cell in the pack (caused from being drained so low over and over again) and the shock from the voltage can cause it to explode

[treelineresearch]

The "jumpstart" is waking up a BMS or integral cell protection circuit and the cell probably didn't actually go completely flat, it just switched open and no longer looks like a battery to the charger. "Jumper cables" will work in a pinch but when the protection circuit goes back into conduction mode it's gonna slam the discharged pack with several amps, which may sometimes let the magic fire out. I use my bench supply set to a current limit of <100ma to wake them up more gently, but a wire with an inline 2W resistor in the 200-300 ohm range will accomplish basically the same thing for safer jumpstarting from another pack. I've woken up a bunch of "dead" 18650 cells reclaimed from old laptop packs and such with no ill effects. Don't try this on cells that are unprotected and actually dead (R/C pouch packs are usually unprotected), only ones that are "playing dead".

[kelqka]

sometimes you're so tired, you need to rest before going to sleep

[marior]

Make sure you have the fire department on speed dial

[tomk]

Batteries are now damaged. They may appear to be working but they may have little capacity or charging them may cause fire.

[relixfour]

Fixed doa battery !! Thank you so much !

[Foefii]

that ladies and gentlemen is how not to do it