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HomeAircraftHelicopterMain Discussion › Overdischarged my LiPo
03-17-2015 04:03 PM  3 years agoPost 1
spinner55

rrApprentice

Tenaha, Tx USA

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I got a new DX9 and am really liking it. I had set up my Trex 450 with a 4 minute countdown timer. Man it was the best weather we have had in a while and it was flying great. Then I heard the motor slow a little, so I landed and realized I had flown 3 minutes overtime. As much noise as this transmitter makes the timer warning defaults to silent.. Don't know why this thing beeps every time I move the roller, but not for my timer. My pack showed 5% on my meter. It seems to be taking a charge, but do you think the damage is done?

"Just because nobody complains doesn't mean all parachutes are perfect."

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03-17-2015 04:21 PM  3 years agoPost 2
jbaum81

rrNovice

Lodi, CA -USA

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Sounds like you hit soft cut. I've done that more times than I care to admit, you're probably fine. The ESC cut's off power before the pack really over discharges (under 3v per cell).

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03-17-2015 04:28 PM  3 years agoPost 3
Tyler

rrElite Veteran

Chicagoland area

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Balance charge it at 1c and use it again. I've hit 0% before according to my test meter! and those packs are still in service two seasons later. Sometimes we can get away with a deep discharge, other times it costs us a pack.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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03-17-2015 04:45 PM  3 years agoPost 4
spinner55

rrApprentice

Tenaha, Tx USA

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Whew, I forgot about soft cut. I did balance charge it at 1c and it seems to be good. Maybe I did get away with it, I just felt like an idiot basically flying till it stopped.

"Just because nobody complains doesn't mean all parachutes are perfect."

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03-17-2015 05:05 PM  3 years agoPost 5
blackkat98

rrVeteran

Shreveport, La USA

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Were you the gentleman at Tinsley Sunday with the 1993 Kyosho?

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03-17-2015 05:30 PM  3 years agoPost 6
Dr.Ben

rrMaster

Richmond, VA, USA

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Overdischarging is certainly not good, but you often come out the backside ok provided the pack didn't get excessively hot.

Main thing is to never try to fast charge a severe discharged pack. Charge slowly and make sure all cells recover.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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03-17-2015 05:40 PM  3 years agoPost 7
rcflyerheli

rrKey Veteran

Granbury, TX USA

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I ran a brand new 3s pack for my flamewheel completely down (it wouldn't register anything on my Hyperion checker). I didn't catch the fact that I had done so until the next day. I really thought it was toast, but I put it onto my ProLab 8 and slow charged it and it has been fine.

I think the amount of time tht it sits at low charge state determines if it will come back.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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03-17-2015 06:41 PM  3 years agoPost 8
spinner55

rrApprentice

Tenaha, Tx USA

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Nope, not even sure where Kinsley is. Do you fly close to Shreveport?

"Just because nobody complains doesn't mean all parachutes are perfect."

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03-17-2015 06:41 PM  3 years agoPost 9
spinner55

rrApprentice

Tenaha, Tx USA

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Tinsley

"Just because nobody complains doesn't mean all parachutes are perfect."

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03-17-2015 08:46 PM  3 years agoPost 10
fenderstrat

rrProfessor

Aston,Pa

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The 80% rule is a guideline for getting the most out of your lipos.an OCCASIONAL flight that breaks this rule usually doesnt do much harm.Just dont make it a habbit and definately not 2 times in a row.A slow balance charge usually brings them right back.Just keep an eye on the balancing the next few cycles and you should be ok

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

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03-17-2015 08:51 PM  3 years agoPost 11
McKrackin

rrProfessor

Lucasville,Ohio

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If your meter happens to be a Hyperion,the pack probably was not really over discharged.

Mine seems to show a % of the 80%

If it says 25%...It means 25% of the 80% of usable juice.
0% would actually be 20%

I don't know if it's by design or not but it seems to be the case.

I literally never use the word literally right.

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03-18-2015 12:41 AM  3 years agoPost 12
Noobyflyer

rrVeteran

Clearwater, FL

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I've done that before and I believe you have accelerated the entropy of the pack. May not be as good as it could be at this point, but chances are you can salvage the pack with a slow balance charge at .5c

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03-18-2015 01:10 AM  3 years agoPost 13
es1co2bar3

rrKey Veteran

winnetka california

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He can use the other battery perimeter other than lipo
when that happen that what I do, when the charge reached 9v then I switch back and charge it as LIPO.

I was waiting on some honey but there aren't no Queen bee,

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03-18-2015 03:15 AM  3 years agoPost 14
es1co2bar3

rrKey Veteran

winnetka california

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You can put the pack in the freezer for a little then
take it out charge it regular, the cold will stimulate
the current and normalize the volt per cell.

They use to have some brainless pack out there you could run them down to zero and have no problem getting them back up to peak.

I was waiting on some honey but there aren't no Queen bee,

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03-18-2015 03:39 AM  3 years agoPost 15
EEngineer

rrProfessor

TX

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They use to have some brainless pack out there you could run them down to zero and have no problem getting them back up to peak.
A LiPo down to "zero"?

Not a good idea

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03-18-2015 03:45 AM  3 years agoPost 16
Ace Dude

rrProfessor

USA

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Charge it very slowly, ~500mAh or 1/4C. Some of the better chargers will even automatically go into restore mode when they detect an over discharged LiPo.

  

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03-18-2015 04:11 AM  3 years agoPost 17
Dr.Ben

rrMaster

Richmond, VA, USA

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For those chargers that won't initiate with a flat pack, another option is to use the Pb program at very low current until the cells show enough voltage to use lipo mode. Don't move from the pack's side while you're doing any of this. Packs won't just up and light off with no warning when being charged at low current while trying to recover a pack. It happens when the wrong current is applied and with no monitoring.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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03-18-2015 04:18 AM  3 years agoPost 18
fenderstrat

rrProfessor

Aston,Pa

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after all this time I am still amazed at the things that get posted about lipos
You can put the pack in the freezer for a little then
take it out charge it regular, the cold will stimulate
the current and normalize the volt per cell.
I dont know of any battery chemistry where freezing it stimulates cells.what exactly does that even mean "normalize the volt per cell"?

I do know Cellpro, and problably other good chargers, wont even charge a lipo thats below 55 deg F normally,so I doubt charging a cold lipo is recommended...I could be wrong but I would have to see a manufacturers ok before I would recommend this

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

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03-18-2015 04:32 AM  3 years agoPost 19
EEngineer

rrProfessor

TX

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freezing it stimulates cells
In the future, -40F packs will become available...for apps unrelated to helis.

For now, our LiPo's are rated at 0F.....but we all push the limit....

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03-18-2015 05:50 AM  3 years agoPost 20
wc_wickedclown (RIP)

rrProfessor

long beach calif

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when my packs got to low to charge on my charger i use like a honey bee balance charger to get enough power back into the lipo so i can throw it back on my charger .

dont know if you have a like honey bee balance charger

Insha Allah made in america

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HomeAircraftHelicopterMain Discussion › Overdischarged my LiPo
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