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› Puffy pack, but good numbers. When is it time to chuck it?
06-02-2013 04:36 AM  5 years agoPost 1
BallisticBlades

rrNovice

Tri-Cities, WA- USA

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Hi guys,

I'm running a T-Rex 600E on 6S, and one of the Turnigy 6S 5000mah 35-45C LiPo packs that came with the heli when I bought it used is getting puffy. It's a little puffed while sitting in storage mode, and a bit more puffy after a flight. However, it doesn't get any hotter than my other packs, and the numbers on each cell look just fine. I am in College and on a tight budget, so I don't want to throw it away, but REALLY don't want to stuff my heli because I pushed the limit. When do you know it's time to retire a battery pack?

I'm fairly new to heli's, and would really appreciate your input!

(PS- sorry if this has been posted in the past and I missed the thread somehow.)

Thanks in advance fella's. Happy flying!

BB

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06-02-2013 03:46 PM  5 years agoPost 2
DemetriusUSN

rrVeteran

Virginia Beach, Va USA

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In my opinion, when packs get puffy its time to get new ones because it's just a matter of time before something bad will happen. It may last awhile but I just don't trust puffy packs. I understand about being on a budget,so best advice get another opack, its not worth trying to fly with it and it explodes. Choice is yours, look on youtube for lipo explosion, some are in flight.

Also, depending on you budget, 6s on that heli is hard on packs, look at a 8s, 10s setup. Look on hobby king for the motors and yep esc.

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770

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06-02-2013 04:46 PM  5 years agoPost 3
BallisticBlades

rrNovice

Tri-Cities, WA- USA

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Thanks Demetrius. I probably am flirting with a REALLY expensive fire (crash) to save a "kind of" expensive one... I recently got a new outrunner (It came with an old in-runner), plus everything to switch it over to flybarless. I'm not quite to the point where I'm 3Ding hard enough to hurt the packs, but the new DFC FBL setup with a better motor should be way more efficient and easier on packs. When I get to that point I'll have to pony up and get a 700. I'll check out those ESC's.

Thanks

BB

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06-02-2013 05:23 PM  5 years agoPost 4
DemetriusUSN

rrVeteran

Virginia Beach, Va USA

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FBL will be more forgiving on the packs. Hopefully nothing crazy, just play it safe.

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770

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06-04-2013 02:46 PM  5 years agoPost 5
Richardmid1

rrProfessor

Leeds, England

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If its only slightly more puffed after a flight I wouldn't worry about it. Its only gasses inside the cells which will expend with heat so try and keep it cool, don't leave it in the sun etc.

You can also simply buy a smaller pinion for the heli to keep the pack cooler in flight and also give you longer flight times. Also cutting the flight shorter than normal and leave say 30-35% in the pack will keep the pack cooler.

60% of the time, it works every time!

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06-04-2013 03:03 PM  5 years agoPost 6
DemetriusUSN

rrVeteran

Virginia Beach, Va USA

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Richard mid1, thanks for technical way of putting it. I will even try it with my tte550s so I can practice my orentations better.

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770

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06-04-2013 04:28 PM  5 years agoPost 7
Pistol Pete

rrProfessor

Seffner, FL

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When do you know it's time to retire a battery pack?
Rule of thumb is
"when it no longer performs for the application it was intended for"

or in other words...when they can not:
* deliver their minimum C rating
* hold at least 80% of their capacity
* charge balance in a short time

You will notice the latter when it takes longer than an hour to balance charge a pack (based on 1C charge).

Most all smart chargers these days at least have a screen mode where you can monitor each cell under a balancing charge. All voltage readings should rise equally. They should decrease equally when under discharge mode. A cell that does not keep on par with the rest is an indication of it going bad or is already.

Puffing is a red flag and unfortunately it is mainly due to abuse such as:
* Over-charging greater than 4.2V per cell
* Over-discharging greater than 3V per cell
* Charging to quickly (Greater than C rating)
* Discharging to quickly (C rating too low for application)
* Improper storing (ie: in car, in direct sunlight... )
* Improper storage voltage (3.85V per cell)

Check charger for proper settings and or operation. They do go bad.
Check ESC settings.(ie: motor timing, voltage cut off, etc)

Fifteen percent (15%) max acceptable puffing is what I have found in the net. Keep in mind we are talking a few millimeters here per cell. Of course, no puffing and longevity is what most of us shoot for.

MORE in depth reading:

BATTERRY LIFE and DEATH

LITHIUM BATTERY FAILURES

WHY BATTERIES FAIL

~~Enjoying the hobby one flight at a time~~

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06-04-2013 04:33 PM  5 years agoPost 8
BallisticBlades

rrNovice

Tri-Cities, WA- USA

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Thanks guys. I don't know how hammered this pack was before I got it, so who knows what it saw in it's last life. I usually only bring them down to 35%-40% just to play it safe, and increase their little LiPo lives as long as possible. Appreciate the help, I'll let you know if it blows up!

BB

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