RR Rated M For Mature
HOME   rrTV-PHOTO   GALLERIES   MY GALLERY   HELP-FAQ
myHOME PM pmRR MEMBERS 369 ONLINE 17 EVENTS SEARCH REGISTER  START HERE
 
1 page1937 viewsPOST REPLY
Boca Bearings . XHELI.COM . Autography FlightPower

.
.
e-Electric Batteries & Chargers > Fully discharged lipos.
 
 
splits
Heliman
Location: Plantation, FL

My Posts This: Topic  Forum		I inadvertently left my TP2100 pack connected to my Quark speed control... I had the Quark's switch off, but forgot to also disconnect the battery after completing the ESC programming session.

The Quark's instructions are clear that the switch, even when OFF, allows a small current to flow from the battery. So I was not relying on the switch... I just forgot to disconnect the pack. I think I was very lucky that the pack did not catch fire, as it was left connected like this for about 10 days!

Obviously, the pack has been totally and completely discharged. But there is no swelling of any of the cells, nor is there that sweet smell that will sometimes emanate from a damaged lipo pack.

I cautiously tried the Triton charger on it, but after about three minutes while slowly raise the voltage from the initial indicated 4.1 volts, the Triton gave a too low voltage warning, and stopped.

I would like to be sure that this pack is totally killed before I dispose of it. Does anyone know this for sure? Or is there anything I could do to bring it back to life safely?

/rick.
05-21-2006 Over year old.
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE  
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

My Posts This: Topic  Forum		dead

toss it, and get another. Your life, possessions, family are not worth it. Sorry. it WILL be a serious issue.

GOOD guy list-39, BAD guy list-0
05-21-2006 Over year old.
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
Dave Cunliffe
Senior Heliman
Location: Midlands, UK

My Posts This: Topic  Forum		I left a 3S pack on my balancer for several hours which took the voltage well down. My charger wouldn't touch it on Lipo mode as it came up with incorrect cell count. The advice I was given by the manufacturer was as it had been discharged very slowly it could still be OK. They told me to put it on a NiMh programme for a few minutes and slowly bring the voltage up to a point where the charger would recognise it as a 3S pack in Lipo mode. I did this and it charged up fine and performed OK for a while, but I must admit I never took my eyes off it when it was charging and I stored it outside.

It lasted a while then died on me, but I'm pretty sure It was a faulty pack to start with as one of the cells was well down compared to the other two even when brand new, hence the reason I forgot it was on the balancer (as it took so long to equalise the pack).

Guess you could try it, but I'd be very cautious.

Dave
05-21-2006 Over year old.
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE  
 
 
GoodTime
Heliman
Location: Sicily - Italy

My Posts This: Topic  Forum		Hi.
Splits, tun off and on the Triton until the battery pack arrives to 9-10 Volt. Then charge the pack at 1/10C or 1/20C (100 or 200 mA) and discharge at 1C (to repeat for three times).
I have recovered one TP lipo pack with this method.

(Sorry for my english..:confused
05-24-2006 Over year old.
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE  
 
 
gorn
Elite Veteran
Location: Western Australia

My Posts This: Topic  Forum		I did exactly the same thing with my 2000 Pro lite in a Shogun.
I left mine connected for about 4 days and it was down to about 7.2 volts
After 10 days like that, hmmmm, depends on if you left it connected after a normal flight time.
I bought mine back to life using Nicd setting first. PM me for full details if you want to have a shot at it.
At the very least the charger as it starts will show you how many volts are in it.
If its real low then I suggest you write it off, just too risky.
Mine is damaged for sure, but I dont know how bad. Guess I'll find out by keeping a flight log for the pack.

If you bling it, they will come :D
05-24-2006 Over year old.
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
splits
Heliman
Location: Plantation, FL

My Posts This: Topic  Forum		So I am trying to fix the pack.

I connected it to the Triton charger and charged at 0.1 Amps in NiMH mode for about 15 minutes. This brought the pack up to about 8 volts. I then reset the Triton for LiPo at 0.1A and after a couple of minutes it gave the "too low voltage" error.

I continued charging in NiMH mode at 0.1 Amps for about 45 minutes, and this brought the pack to just over 10 volts. I then tested to see if the Triton was now able work on the pack in LiPo mode. It will... Good! So far, I only allowed the Triton to charge the pack to about 10.75 volts

I am now going to buy a balancer and balance the pack before continuing to a full charge. I am fearful that the pack has become unbalanced (or that one or more cells is charging faster than the others) after such a deep discharge, so better not to risk a full charge and blowing out a cell.

If the full charge is successful, I will follow the advice of doing some discharge cycles before trying to put the pack back in service. I will post the results.

BTW, any recommendations on a balancer?

/rick.
05-24-2006 Over year old.
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE  
 
 
nivlek
rrProfessor
Location: Norfolk England

My Posts This: Topic  Forum		Hi splits ,
I think that you might be OK . A mate did a similar thing with a 7.4V pack for his buggy , ie left it connected and totally flatened the pack . Now , how he brought the voltage up , I wouldn't recommend to any body - he momentarily "dabbed" the Lipo leads across his car battery !
However , after doing that , he was then able to charge the pack and has had it back in service with no noticeable penalty .
If I encounter the same problem , I have a plan ! That is to connect the Lipo Pack up to a fresh 9V PP3 battery via a suitable resistor and leave it out side in a suitable container where it can't do any damage . That way hopefully it would gradually come back up with the minimum of risk to persons and property .

At the end of the day , it gets dark .
05-24-2006 Over year old.
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE  
 
 
1 page1937 viewsPOST REPLY
Advantage Hobby . Revolution Models . CarbonXtreme

.
.
e-Electric Batteries & Chargers > Fully discharged lipos.
 Print TOPIC Advertisers 

Subscribe to This Topic

Sunday, November 8 - 10:27 am - Copyright © 2000 - 2009 runryder.com | email | link to rr | START HERE | NF