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Old Nov 16, 2010, 08:38 PM
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Old Dec 26, 2010, 01:11 PM
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thanks for putting this info together in one place. very helppful

my situation is a little different than the links you posted.

I have that parkzone ulta micro 4 battery charger. I had 4 charging at the time i bought my wildcat. then i left them sit in the charger for a month or two :|

My carger things they are charged. yet my blade msr and pz p-51 disagree. the life on them is very short. some are seconds. others a minute or so at WOT.

I plug them in. some charge solid for a few minutes then start to blink which means they are "almost full". my charger reconizes all them. they just have a very small winndow. VERY small. i tried charging with my hyperion charger with similar results. I keep discharging and recharging which may have helped a little. not much. Am i just screwed? these 1s batteries seem very delicate. im going to try a hyperion 130 and 160mah. maybe pz batteries just suck?
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Old Dec 26, 2010, 02:04 PM
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They probably discharged while sitting in the charger. Many (most) chargers do not completely disconnect from the battery when turned off. They will continuously suck a little bit out of the pack when unpowered. I'm guessing you over-discharged them which can permanently damage them.
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Old Jan 01, 2011, 05:34 AM
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hi and happy new year
i have a problem with a 11.1v 3 cell battery because the older charger walkera ga-002 was charging just 2cells.
so yesterday i got a new imax b6 , it says 4.20v for the 2 cells and 1.9v for the last one .
when try charging or balancing it goes 1mn than shows a full battery message , i tried discharging but its only the 1.9v cell that goes to 0.8v the others lows to 4.12v i couldn`t get lower voltage ...

what do you advise me to do? is it possible that the battery is dead ?

li po 4000mah 11.1v + imax b6
thanks for help
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Old Jan 01, 2011, 02:36 PM
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The battery is probably a candidate for a 2-cell pack or the garbage. Cells under 2.5V for any length of time can be permanently damaged. The only thing you could try is charging the 1.9V cell up to 4.2V by charging that one through the balance tap by itself.

Beware! Damaged packs like this one can be unsafe. I'd treat this one especially like a fire ready to happen. If you do anything, I'd recommend doing it outside in a fire safe place and always storing it in a fire safe place.
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Old Jan 01, 2011, 09:01 PM
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Thanks for help Hopy , im going to buy a new one , best thing to do
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Old Jan 05, 2011, 01:05 PM
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Hey quick question for you guys, Im still new to lipos so how do you tell when a pack is dead because of its cycle life? Does that make sense? In other words if a battery has been properly cared for etc how do you tell if it has too many cycles?

Thanks,
Mad
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Old Jan 05, 2011, 01:55 PM
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Easy, when you are unhappy with the flight time and/or performance you are getting, it's dead.

The manufacturers say when it has lost 20% of it's capacity it's time for a new one.
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Old Jan 05, 2011, 02:07 PM
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Quote:
Originally Posted by hoppy View Post
Easy, when you are unhappy with the flight time and/or performance you are getting, it's dead.

The manufacturers say when it has lost 20% of it's capacity it's time for a new one.
haha ok sweet thanks
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Old Jan 10, 2011, 10:49 AM
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I shorted out a new 2200 3s battery soldering my deans. It is now a 2s. Is there anyway of taking it apart and fixing it or did I kill it?
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Old Jan 10, 2011, 10:58 AM
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IMO, get a new battery. If the short was hard and long enough
to melt a tab, all the cells are probably damaged.
Remember, the short current went through all the cells, not just one.
The one with the open tab just happened to have the thinnest tab.

There are many threads on making a 3s into a 2s, try the search function.
http://www.rcgroups.com/forums/showt...ght=convert+3s
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Old Jan 10, 2011, 10:51 PM
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lipo

Thanks Hoppy, I will look into how much I damaged each cell now that I know I have to take it apart.
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Old Jan 23, 2011, 09:52 AM
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Off-topic...

Quote:
Originally Posted by rich smith View Post
Hoppy... Hoppy... Hoppy... tsk... tsk...

What makes you think they will pay any attention now? Lonely and lazy noobs will always start new threads on the subject even if 5 identical ones precede.

Like death and taxes...
Do you have any idea how much information there is here? Or how long it would take someone to read everything here?

The point is, yes some are not going to read anything; and others will read plenty. Either way, people are always going to have questions that someone has answered before. For the experts that don't mind answering the same questions week in and week out...I thank you, because I'm a "noob"; and I'm sure there will be another one to come next week. So do you want more folks in the hobby, or is it a specialized club for experts only? And how exactly did those experts get to be experts?
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Old Jan 23, 2011, 10:31 AM
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Quote:
Do you have any idea how much information there is here? Or how long it would take someone to read everything here?
If this question is for rich, don't expect an answer as he hasn't been on the forum in over 6 months.....

If it's for me, let me say:
The first post of the first reference pretty much says it all. No additional reading is required except by those who might be interested in problems others have had. Some people like to read everything and some just want the meat.

Over 3500 modelers have checked the sticky out so it must have some value. Maybe that's 3500 fewer times an expert would have had to have posted the same answer.
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Old Jan 23, 2011, 10:46 AM
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Hey Hoppy. It was for Rich. Yes, the topic has lot's of value. I was just pointing out that with so much information out there and in these forums that for a "noob" we can only learn so much at one time. I read a lot of stuff, but for somethings I just need the answer so that I can keep progressing. As I get certain things down, then I'll spend some time learning more about the stuff I just "wanted" answers to.

Thanks again to everyone here. A most helpful group!
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