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ZoomsHobbies . HeliHobby . Ron’s HeliProz South

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e-E-Sky Honey Bee- Lama- Belt CP- E-Smart > Below 20%
 
 
wkic
Senior Heliman
Location: Louisville, KY

Just hooked a battery up to charge and the charger says I got 10% left. It's a Esky 1500 with no more than 10 cycles. I got a cellpro 4 and just want to know can this batt be saved or is it unsafe to try and use again.

Kevin

He who has the most toys in the end wins
07-17-2008 02:26 AM
 
 
thrstrmech
Veteran
Location: CA, USA

dunno, have been able to salvage my 1350 megapower with roughly 35% by fully discharging it and brinning it up slowly, batt works fine, no defects noted from doing so, maybe i "just got lucky", hey wasn't that a titled song by Dokken

good luck

i suck at this, but having the time of my life with it!
07-17-2008 02:38 AM
 
 
wkic
Senior Heliman
Location: Louisville, KY

I'll try and charge it just don't want to burn the house down.

He who has the most toys in the end wins
07-17-2008 02:44 AM
 
 
thrstrmech
Veteran
Location: CA, USA

trash the stock charger, you'll be better off and not likely to burn the house down

i suck at this, but having the time of my life with it!
07-17-2008 02:45 AM
 
 
wkic
Senior Heliman
Location: Louisville, KY

Using the Cellpro 4. I hope this helps

He who has the most toys in the end wins
07-17-2008 02:48 AM
 
 
fenderstrat
Elite Veteran
Location: Aston,Pa

the 80% rule is a guideline for getting long life out of your battery,it does not mean you have killed it.going below 20% occasionally will do nothing,just dont make a habit of it.if the battery is not puffed or otherwise damaged you should be fine.I've actually had batteries down to 0% a few times and they are still going strong

PerformancePlusRC field rep
TT Mini Titan
HBK2
Futaba FASST
07-17-2008 03:03 AM
 
 
TJinGuy
Elite Veteran
Location: Socorro, NM - USA

The Cellpro fuel gauge is not 100% accurate and depends on the resistance of the battery and other factors. The only way to know for sure how much you used is to wait and see what it puts back in.

- Chris

Variety+spice+life=King2+Rex450+Some500
07-17-2008 03:11 AM
 
 
wkic
Senior Heliman
Location: Louisville, KY

Will the batts have a greater chance of puffing before charging or after. Also what or where do you all store your batts. I couldn't imagine going through another house fire.

Kevin

He who has the most toys in the end wins
07-17-2008 03:11 AM
 
 
TJinGuy
Elite Veteran
Location: Socorro, NM - USA

The way I understand it, LiPos puff because of excessive heat (pack above 140F) or over discharge (dropping pack below 3V per cell). I think most has to do with heat and running a pack way down causes a lot of it. So if they are not too warm, then I am sure you are fine.

As for storage, I just keep them on my workbench and never give them a second thought. The only ways to get a LiPo to burst into flames is to either damage it or over charge it. Otherwise they are no more dangerous than anything else in your house. At least that is my view, take care of your batteries and they will take care of you.

- Chris

Variety+spice+life=King2+Rex450+Some500
07-17-2008 03:16 AM
 
 
fenderstrat
Elite Veteran
Location: Aston,Pa

you know what cracks me up about this?for some reason hobby lipos have this reputation for exploding for no reason.as TJ said if its not damaged or really overcharged/discharged its safe as can be...these same people are carrying around cell phones,laptops,pda's blackberry's ect and dont give it a second thought.....99% of the lipo fire stuff was from the early days when people were using chargers NOT designed for lipos at all using wrong cell counts and wrong charge rates.....with the new generation lipos/chargers you REALLY need to try to blow up a lipo

PerformancePlusRC field rep
TT Mini Titan
HBK2
Futaba FASST
07-17-2008 03:29 AM
 
 
TJinGuy
Elite Veteran
Location: Socorro, NM - USA

Word.

- Chris

Variety+spice+life=King2+Rex450+Some500
07-17-2008 03:30 AM
 
 
Gregor99
Key Veteran
Location: Western Wa

I keep mine in 50 cal ammo box. When I first started I was ultra paranoid about lipo fires. As I've learned more about thier causes, I've relaxed quite a bit. I still use the can, just in case. But also to provide some protection for the packs. Never know when one of the kids is going to go looking for a screw driver and knock something off the work bench. Its never happened, they are usually more careful than that. But I do it anyway.

Taking the road less traveled
07-17-2008 03:59 AM
 
 
shizack
Veteran
Location: Augusta, GA USA

Does the "80% rule" really matter as long as the individual cells are 3.2V or higher? I've taken mine down below 20% nearly every time I fly a full pack, but have never gotten below 3.2V. Never below 3.5V, actually.

I was timing a flight to see where the LVC kicked in. It starts "jumping" at 10 total pack volts. I landed immediately, took off a minute, cut it in half (to get 2 flights per pack; I only have one pack for the Trex), and set my timer. I get 2 4 minute flights per pack with no LVC. Yet, I still come in under 20% but over 3.5V/cell. I can't see this causing any damage. I use the Cellpro 4S/4A.

Just because you're paranoid doesn't mean they're NOT out to get you...
07-17-2008 07:33 AM
HOMEPAGE  
 
 
Gregor99
Key Veteran
Location: Western Wa

80% Lipo discharge rule outdated?
http://www.runryder.com/helicopter/t438903p1/

I've adjusted my battery usage based on temps at the end of the pack. If we use 140f the danger zone (FMA says 160f is the damage zone), the closer you get to it the worse for your pack. This means you need to adjust flight times based on ambient temps, age/condition of packs and current draw of the model.

I'm trying to keep pack temps below 120f. With typical ambient temps my packs range from 105f to to 115f. I could go further, but I don't have the need to. My flight times are long enough. At those temps pack comsuption ranges from 70% to 80% depending on the pack.

Taking the road less traveled
07-17-2008 05:55 PM
 
 
shizack
Veteran
Location: Augusta, GA USA

I just put my cooled-down 3S 2200mah battery on the Cellpro. Fuel gauge said 12%, but individual cell voltages were between 3.71 and 3.72V.

This was after 2x 4:15 flights. So, is the fuel gauge really that inaccurate with the Cellpros?

I'll let it charge fully and see what goes back in.

Just because you're paranoid doesn't mean they're NOT out to get you...
07-21-2008 03:08 AM
HOMEPAGE  
 
 
tryan02
rrProfessor
Location: Canton, Missouri

OK first off shiz Im done whining about the nitro's well maybe?

I have found my cellpro to be pretty consistent from FMA pack to align both same amounts of flight time read the same Although I would trust the voltmeter more than the fuelguage. Mainly cause if you break it down packs have internal resistance and capacitance And these two physical makeups from different packs or even the same packs could mislead the cellpro quick analysis of the drained pack as a fuelguage is just a stupid calculation but that calculation on the opposite end will be better if you see how many mA you put back in than how much you've drained.

Canton MO backyard flying club
Club President
Team No funds left.
07-21-2008 03:24 AM
HOMEPAGE  
 
 
Gregor99
Key Veteran
Location: Western Wa

My Cellpro consistantly over reports battery consumption between 3% and 7%. This is on my Outrage packs, my old FMA packs and even on my new FMA pack.

Taking the road less traveled
07-21-2008 04:07 AM
 
 
shizack
Veteran
Location: Augusta, GA USA

It put back 1822mAH, so it was actually down to 17.2%. I don't think that's pushing it too far. 'S'all good now.

Quote 
G-Whiz: Every Flight has a purpose - Don't miss it

No kidding. If you blink you might miss the crash.

Just because you're paranoid doesn't mean they're NOT out to get you...
07-21-2008 04:13 AM
HOMEPAGE  
 
 
Gregor99
Key Veteran
Location: Western Wa

Quote 
Shiz-r-me-timbers If you blink you might miss the crash

I thought that's why everyone is so hot to get thier birds to hover hands off. No need to fly, let it do its own thing. I think Slider (miss that guy) even left his Trex outside hovering while he was posting on RR. I'm a hands on flier. So I have my heli tuned for hands on hover

Taking the road less traveled
07-21-2008 04:18 AM
 
 
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e-E-Sky Honey Bee- Lama- Belt CP- E-Smart > Below 20%
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