View Full Version : Shorted out a Li-Po pack????
GTB_USER_ERIK
09-06-2006, 12:31 AM
Hello all
I was charging my 5000Mah 3s pack.
as I was removing it from the charger the power leads ever so shortly (pardon the pun) touched each other and then came apart, I'm talking the
(they just touched each other and the fell off each other). But enough for me to wonder if the pack is still useable???
I hope it is, but if not I know what to do. :confused:
Please help
Peace and Goodwill :o
Shawn Palmer
09-06-2006, 12:47 AM
Keep an eagle eye on that pack from now on every second it's on the charger charging.
99.99% of pack "events" happen on the charger (except for physical damage and such) with a pack that has been compromised.
Most common damage in lipos comes from one of the following:
1) lower than 3.0v per cell voltage. the lower the voltage, and the longer it lasts, the more damage there is
2) higher than 140F temps. the higher the temp above 140, and the longer it lasts, the more damage.
3) Shorting of any kind. Longer it stays shorted, the worse the damage.
4) long term storage at full charge. if they won't be used for longer than a month, fully charge the pack, then discharge it down to 2/3 to 1/2 the full Mah. The longer it's stored at full charge, the more damage.
All the above damage is cumulative - meaning it builds up over time and is not reversible. A pack that is continually abused even ever so slightly will eventually have an "event" while on the charger. A pack that's abused heavily will cause it to happen sooner.
Shawn
GTB_USER_ERIK
09-06-2006, 12:59 AM
Shawn,
Thank you for the responce, I will keep an Eagle Eye on the pack. And the next time it goes on the charger it will be in the 'Li-Po' sack which I bought just in case there was an "Event" while charging.
Peace and Goodwill :o
Shawn Palmer
09-06-2006, 01:14 AM
Sweet.
Mark Wood (inventor of the LipoSack) is a dear and long-time friend of mine.
I'm recently married, and have an "instant family" of 2 kids as well as my new wife. Hundreds of lipo packs that used to be stored randomly at best, are now all safely in many many Lipo Sacks, and are only charged in several dedicated ones that I keep near my charging bank. Mark not only one day may save my families lives, but how about that warranty?!?!?! Have an "event" in one, and he sends you a new Lipo Sack for free!
Shawn
GTB_USER_ERIK
09-06-2006, 01:24 AM
Shawn,
I showed my Wife an 'Event' showing the Li-Po igniting, and she not only insisted, I get one she bought it for me. ;)
Peace And Goodwill :D
GTB_USER_ERIK
09-06-2006, 01:26 AM
Shawn,
I showed my Wife an 'Event' showing the Li-Po igniting, and she not only insisted, I get one she bought it for me. ;)
Peace And Goodwill :D
And I do like that warranty ;)
GTB_USER_ERIK
09-06-2006, 01:27 AM
Sorry for the double post
TheSteve
09-06-2006, 02:37 AM
Shawn nailed it all as usual - I would add though that if there is the possibility something can short you need to re-evaluate your connector/charging methods. You must use a method that cannot be shorted, use good solder connections on all connectors and heatshrink everywhere required - no exposed wires/leads anywhere.
tcolesen
09-06-2006, 04:36 PM
In my experience with shorting individual cells while building packs, short shorts don't do much. But when shorting a pack, the biggest thing to worry about (IMO) is each connection. When you short a pack, a large surge of current goes through all of the connections. If the connections aren't up to handling the huge current, they can be damaged or even ruined.
GTB_USER_ERIK
09-06-2006, 07:25 PM
This all happened when a familiy member distracted me when I was removing the leads from the charger. This is the only time it has ever happened. I will change the way I disconnect the pack from the charger though. thanks all.
Peace and Goodwill
Sweet.
Mark Wood (inventor of the LipoSack) is a dear and long-time friend of mine.
I'm recently married, and have an "instant family" of 2 kids as well as my new wife. Hundreds of lipo packs that used to be stored randomly at best, are now all safely in many many Lipo Sacks, and are only charged in several dedicated ones that I keep near my charging bank. Mark not only one day may save my families lives, but how about that warranty?!?!?! Have an "event" in one, and he sends you a new Lipo Sack for free!
Shawn
got a link to this liposack? :D
tcolesen
09-06-2006, 11:00 PM
Try http://liposack.com :D.
GTB_USER_ERIK
09-06-2006, 11:37 PM
I got mine from www.cheapbatterypacks.com
thanks guys, cheapbatterypacks doesn't have them. i'ms sold from what i've seen.
GTB_USER_ERIK
09-07-2006, 08:58 AM
They do. you need to go to the Li-Po cells and the are are at the top of the descriptions.Click on any of the cells, and you will find a sack at the top of the page
i read on the internet where shorting out li-po cells might be a problem.... and might ruin the pack..... i have also read that they might be very dangerous...... but have read elsewhere on the internet where they safe......
They do. you need to go to the Li-Po cells and the are are at the top of the descriptions.Click on any of the cells, and you will find a sack at the top of the page
cool I found it. sorry for being off the topic but will i need this for a team orion platinum lipo pack?
GTB_USER_ERIK
09-08-2006, 01:48 AM
Its not, will you need it for any brand of Li-Po, its insurance for when there is an'Event'. when your cells decide to give up the ghost. And since we dont ever know that. Why take a chance. I own my home, and the last thing I want the Fire Investigator to tell me is the Fire could have been prevented, and then the insurance wont pay off.
Peace and Goodwill