Belt CP li-po dead after one charge????

Belt CP li-po dead after one charge????
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Belt CP li-po dead after one charge???? - 1/26/2008 5:19:44 AM

Muddin_Mavric

Posts: 30
Joined: 1/26/2008
From: , WI, USA
Status: offline

Well i just got my belt CP tonight. I have Rc planes and a rc truck but i have kinda not done much with them for awhile. my rc truck has a blown engine and i dont have a good landing strip for the planes so i thought maybe a heli would make for a good time. i know all about NiCads but up until about 2 weeks ago i have never even herd of a li-po battery.

i put the battery on the charger and read through the instructions and in there it says not to charge the batterys for more than 120 minutes. so i had it on there for 3 hours and the green light was still blinking so i figured well that must be long enough its time to go fly it. i spun up the rotor in the house a few times and then took it out to the garage since its snowing out right now. i attempted to hover (un secesfully as expected) untill the speed control shut down cause the battery got to low. i let the pack cool off and now when i try and charge it the red and green lights just sit there and blink. the voltage at the deans plug is about 6.8 volts, is that too low??? you guys got any idea why it wont take a charge?? do i need a new battery or charger???

these Li-Pos are all new to me so any info you might have as to why it wont charge would be great

Thanks

Justin

Post #: 1

RE: Belt CP li-po dead after one charge???? - 1/26/2008 5:23:17 AM

Druss

Posts: 4175
Joined: 8/10/2007
From: Edmonton, AB, CANADA
Status: offline

you really should have read up on lipos before using it....

your battery is DEAD!! dead, dead.

lipo batteries CANNOT be discharged below 3v per cell (to be safe you should stop at 3.3v per cell) which is 9V for the battery (because it's a 3 cell) or 9.9v if you're being safe. throw that sucker out and get a new one. next time as soon as you feel ANY loss of power stop and check the voltage.

(in reply to Muddin_Mavric)

Post #: 2

RE: Belt CP li-po dead after one charge???? - 1/26/2008 5:29:27 AM

Muddin_Mavric

Posts: 30
Joined: 1/26/2008
From: , WI, USA
Status: offline

i guess i figured the instructions would contain any need to know info on the battery. guess i was wrong.

how come going below 3 volts a cell kills them??? i find it hard to beleave that they would make batterys that are that touchy.

(in reply to Druss)

Post #: 3

RE: Belt CP li-po dead after one charge???? - 1/26/2008 6:04:13 AM

Muddin_Mavric

Posts: 30
Joined: 1/26/2008
From: , WI, USA
Status: offline

well looks like i got it to take a charge. You can go a head and tell me how stupid i am and how little i know about li-po batterys but i hooked it up to my hobbico accu-cycle charger for NiCads and charged it at 500 ma till i got over 9 volts then put it on the esky charger. right now im at 10.7...11.0 volts and climbing on the esky charger. i guess tomarow i will see if its still any good. as long as it makes it a week or two more ill be happy. i was gona order a couple more batterys when i needed to get some parts after i crashed. maybe ill have to get them and maybe a better charger sooner.

(in reply to Muddin_Mavric)

Post #: 4

RE: Belt CP li-po dead after one charge???? - 1/26/2008 7:10:27 AM

guru101

Posts: 186
Joined: 4/11/2006
From: BathurstNSW, AUSTRALIA
Status: offline

quote:

ORIGINAL: Muddin_Mavric

well looks like i got it to take a charge. You can go a head and tell me how stupid i am and how little i know about li-po batterys but i hooked it up to my hobbico accu-cycle charger for NiCads and charged it at 500 ma till i got over 9 volts then put it on the esky charger. right now im at 10.7...11.0 volts and climbing on the esky charger. i guess tomarow i will see if its still any good. as long as it makes it a week or two more ill be happy. i was gona order a couple more batterys when i needed to get some parts after i crashed. maybe ill have to get them and maybe a better charger sooner.

I will go first.

You are an idiot mate, and you know nothing about Lipo batteries. Charging a lipo with a non lipo specific charger is a certain recipe for dizaster. You will probably be lucky to see your house, yourself and your family survive the ensuing fire in the next week or two let alone an already fried lipo lasting after that kind of abuse. If you cant take advice from people that have the knowlage you asked for, you certainly should not be trusted to use lipo batteries. Do yourself a favour and read up on the risks involved with lipo batteries, then buy yourself a proper lipo balance charger and lipo batteries.

Thats all i will say on the matter.

(in reply to Muddin_Mavric)

Post #: 5

RE: Belt CP li-po dead after one charge???? - 1/26/2008 9:47:05 AM

Druss

Posts: 4175
Joined: 8/10/2007
From: Edmonton, AB, CANADA
Status: offline

quote:

ORIGINAL: Muddin_Mavric

well looks like i got it to take a charge. You can go a head and tell me how stupid i am and how little i know about li-po batterys but i hooked it up to my hobbico accu-cycle charger for NiCads and charged it at 500 ma till i got over 9 volts then put it on the esky charger. right now im at 10.7...11.0 volts and climbing on the esky charger. i guess tomarow i will see if its still any good. as long as it makes it a week or two more ill be happy. i was gona order a couple more batterys when i needed to get some parts after i crashed. maybe ill have to get them and maybe a better charger sooner.

wow... wow...

even after I specifically told you to read up on lipos, because you ruined the first one, you still didn't do any reading.

The following is a quote from the hobbico site.

quote:

With little more than the press of a button, the Accu-Cycle discharges, charges and conditions NiCd or NiMH cells and packs - while simultaneously measuring and displaying valuable information telling you the condition of your batteries.

The following is a quote from the Thunder Power (one of the best known lipo battery manufacturers) safety and instruction sheet found on their website.

quote:

Use Lithium Polymer specific chargers only. Do not use a NiCd or NiMh charger - Failure to do so may cause a fire, which
may result in personal injury and property damage.

PLEASE follow the safe and correct procedures with these batteries. I CANNOT believe that after I had told you that you had ruined your battery, that you should read up on lipos, you would do anything to it without actually reading up on lipos... it just boggles the mind. I specifically stated to throw it out... yes? no?

Watch the following video on lipo exposions

http://www.youtube.com/watch?v=gSgjj6NT5U8

< Message edited by Druss -- 1/26/2008 9:52:04 AM >

(in reply to Muddin_Mavric)

Post #: 6

RE: Belt CP li-po dead after one charge???? - 1/26/2008 3:04:11 PM

UH60Mech

Posts: 83
Joined: 10/29/2007
From: Temple, TX, USA
Status: offline

Dude, Li-Po batteries can be worse than old dynamite or nitroglycerin if miss handled or improperly charged...

Unfortunately you received a bad battery with your new purchase (it happens from time to time)...

save yourself from even the smallest chance of destroying your bird or even possibly everything you own...

listen to Druss, read the literature that is out there, watch the video.... but most of all CHUCK that Li-Po and get new ones before you go any further....

(in reply to Druss)

Post #: 7

RE: Belt CP li-po dead after one charge???? - 1/26/2008 6:01:26 PM

Druss

Posts: 4175
Joined: 8/10/2007
From: Edmonton, AB, CANADA
Status: offline

quote:

ORIGINAL: UH60Mech

Unfortunately you received a bad battery with your new purchase (it happens from time to time)...

Don't want to nitpick here but I really have no sympathy for this guy. He admits that he charged then flew his heli until the low voltage cut off.

quote:

ORIGINAL: Muddin_Mavric

i attempted to hover (un secesfully as expected) untill the speed control shut down cause the battery got to low. i let the pack cool off and now when i try and charge it the red and green lights just sit there and blink. the voltage at the deans plug is about 6.8 volts, is that too low???

< Message edited by Druss -- 1/26/2008 6:02:11 PM >

(in reply to UH60Mech)

Post #: 8

RE: Belt CP li-po dead after one charge???? - 1/26/2008 6:37:22 PM

Kaelan

Posts: 353
Joined: 12/6/2005
From: Kingston, GA, USA
Status: offline

WOW!! guess this guy likes playing with dynamite.. because that's basically what his LiPo is right now... an old unstable stick of dynamite..

Muddin_Mavric.. please do not store that Lipo anywhere near anything you can't afford to lose to a fire (lithium polymer batteries burn at temps around 2000F).. a Lipo is nothing like a NiCad.. Nicads can take a beating.. be over discharged and still come back for more.. a Lipo will be damaged. A Lipo can even explode if it get damaged in a crash. If that battery pack shows even the slightest sign of swelling, dispose of it.. buy a new one.. but what ever you do, do NOT charge it again.. do NOT bring it in your house and do NOT use it anymore. you're no longer dealing with toys here, this is serious stuff.

_____________________________

Gaui Hurricane 550 CF
HeliPro BlackHawk 450SE

(in reply to Druss)

Post #: 9

RE: Belt CP li-po dead after one charge???? - 1/28/2008 3:45:31 AM

Muddin_Mavric

Posts: 30
Joined: 1/26/2008
From: , WI, USA
Status: offline

well im a little bit disapointed. i was looking forward to an explosion or at least a small fire ball, but i got nothing! charged it 2 more times yet and got 2 more flight out of it and still nothin. dont even get warm. wont swell up. thats really too bad. had a little run in with a snow bank. as soon as i get a flybar case set and new tail boom and main gear i will be up for a few more flights.

i would like to thank the one person who sent me a PM and was trying to be helpful. the rest of you guys are full of it. i would agree that the pack "could" be damaged but its not. maybe you just see a vid on the internet and dont completly understand the conditions in which a pack explodes. if a pack dont get warm and doesnt expand then its not goin to just explode. maybe you should have payed better atention in physics class. and also it doenst matter if a charger is made for Li-Po or nicad or NMIH as long as its charged at the proper votage and current and is not over charged. that just shows how little you know about the battery charging prosses.

Justin

(in reply to Kaelan)

Post #: 10

RE: Belt CP li-po dead after one charge???? - 1/28/2008 4:02:16 AM

bigairhonda

Posts: 122
Joined: 3/17/2006
From: davison, MI, USA
Status: offline

I have read this thread and was wondering. If you run your battery till the low voltage cuts out on the speed controller will this ruin your batteries? Also is it normal for the battery to be slighly warm and ever so slightly puffy after a run? I know that batteries can exploded when put in fire,ect and all that. And Im sure that lipo batteries burn at an extremely high temps and are probably more hazardous than typical batteries. And I also know that they need to be handled with care. But are they really that unsafe LIKE dynomite? What are the chances of one blowing up when charging with a proper charger? If so good thing they are putting them in that new Chevy Volt thats comming out. I would surely like to ride around in a time bomb.

< Message edited by bigairhonda -- 1/28/2008 4:19:27 AM >

(in reply to Muddin_Mavric)

Post #: 11

RE: Belt CP li-po dead after one charge???? - 1/28/2008 4:21:34 AM

Muddin_Mavric

Posts: 30
Joined: 1/26/2008
From: , WI, USA
Status: offline

From what i have read running them that low is not a good idea. the Esky charger when pluged into them sees that they are low and will not even try and charge them because they "could" be damaged. and "could" pose a safty hazard. that how ever doesnt mean that they cant be charged with the right charger. the way i did it is not the right way but if you use some common sence it "could" work. on my first flight in a heated garage before i ran them low the pack was slightly warm but it was not puffed up at all. my last 2 flights were out side with temps at 20*F so they didnt get warm at all or puffed up. From what i have read when they puff up is when they can burst and thats when you have the safty issues because it can start a fire or explode.

(in reply to bigairhonda)

Post #: 12

RE: Belt CP li-po dead after one charge???? - 1/28/2008 4:42:42 AM

cactus hopper

Posts: 653
Joined: 11/17/2007
From: , AZ, USA
Status: offline

Bigairhonda, the ESC should protect the battery, depends on the ESC I suppose. I use mostly Hobby Wing ESC's and you can set them for either a 3.1v, 2.85v or 2.6v cutoff. I've run a 2S in an Esky FP until it wouldn't even move the blades and then checked the voltage and the battery still had 7.4 volts, or 3.7 volts per cell.

_____________________________

I don't fly em, I just build em, saves me a lot of money in repairs that way.

(in reply to Muddin_Mavric)

Post #: 13

RE: Belt CP li-po dead after one charge???? - 1/28/2008 1:13:47 PM

Kaelan

Posts: 353
Joined: 12/6/2005
From: Kingston, GA, USA
Status: offline

quote:

ORIGINAL: bigairhonda

I have read this thread and was wondering. If you run your battery till the low voltage cuts out on the speed controller will this ruin your batteries? Also is it normal for the battery to be slighly warm and ever so slightly puffy after a run? I know that batteries can exploded when put in fire,ect and all that. And Im sure that lipo batteries burn at an extremely high temps and are probably more hazardous than typical batteries. And I also know that they need to be handled with care. But are they really that unsafe LIKE dynomite? What are the chances of one blowing up when charging with a proper charger? If so good thing they are putting them in that new Chevy Volt thats comming out. I would surely like to ride around in a time bomb.

the Chevy Volt uses a Lithium-Ion battery.. much safer than LiPo.. as far as them exploding if you use the proper charg