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HomeAircraftHelicopterMain Discussion › anyone know this guy t lankford01?
06-01-2009 04:24 PM  9 years agoPost 1
BOBBY1017

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PETALUMA, CA, USA

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heres the original post: http://www.runryder.com/t489095p1/

I bought the 2 fp batteries. One came in at 0% capacity. sent the battery back to Toby and have been waiting for about a month for a refund which Toby agreed to. He finally sent me a refund through pay pay but it failed because there was no money avail. Now he will not respond to me. This is the first time in over 100 online deals on RC groups and here that I've had a bad experience.

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06-02-2009 02:24 AM  9 years agoPost 2
Saint728

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Honolulu, Hawaii

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One came in at 0% capacity.
What do you mean by 0% capacity? I would suggest rechecking the voltage again as I find it hard to believe a 5S pack would have 0% voltage in it. It always has something in it even if it is discharged.

Take Care,
Cheers, Patrick

Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo

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06-02-2009 02:26 AM  9 years agoPost 3
co_rotorhead

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Centennial, CO, USA

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Here's some light reading for you. Sorry man.

http://runryder.com/t446026p1/?highlight=lankford

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06-02-2009 03:29 AM  9 years agoPost 4
BOBBY1017

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PETALUMA, CA, USA

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The resting voltage was 16.50 v which is 0% capacity according to my cell meter 8. Battery #1 was the bad one.

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06-02-2009 03:30 AM  9 years agoPost 5
BOBBY1017

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PETALUMA, CA, USA

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For some reason I only looked at the first page of his feedback.

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06-02-2009 03:40 AM  9 years agoPost 6
GyroFreak

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Orlando Florida ...28N 81W

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The battery is a 5S, and at 16.518 volts means each cell is 3.3 volts per cell. It could just means it needs charging. You should have charged it with a balancer to see if any cells were below 3.3v. It may have been fine.
EDIT:
I don't know what the lower line on your checker means, but if all cells are 3.3 volts and above it probably is OK.
Any body else agree ???

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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06-02-2009 04:11 AM  9 years agoPost 7
GyroFreak

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Orlando Florida ...28N 81W

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Geezz, I just read the light reading link by rotorhead, sorry man, wish you hadn't sent the battery back, it might have been ok, lot of good that does you now.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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06-02-2009 05:28 AM  9 years agoPost 8
Flying Brian

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St. Clairsville, Ohio

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I thought 3.3 should be fine to. Just needs a charging on a balance plug, right?

"I just don't Listen" "

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06-02-2009 06:03 AM  9 years agoPost 9
BOBBY1017

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PETALUMA, CA, USA

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I never go below 18.9 v resting after a flight. As far as I've heard using more than 80% capacity is a problem. So when I recieved this I figured why keep a potentially damaged lipo.
The second line show the voltage of the highest and lowest cells. Usally this is within .01v on good batterys, although in a discharged state this # tends to be higher.
If I had known this would have happened I would have kept it.

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06-02-2009 06:38 AM  9 years agoPost 10
what_the_helli

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cookeville, tn USA

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80% is for a margin of error.
3.3v per cell is fine. You can even go to 3v per cell without damage. We don't though because the danger is that at the low end of the voltage, it drops fast and can easily get to low before you catch it. not to mention as the voltage drops the batt gets hotter and heat is really hard on lipos

I put the fun in dysFUNctional :)
Team KBDD & Funding by TnPrintMasters.com

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06-02-2009 06:46 AM  9 years agoPost 11
BOBBY1017

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PETALUMA, CA, USA

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It may have been fine, but it made me wonder what had been done to it. I would think someone would check the voltages before they ship it to avoid problems. Although in this case he got the money and the battery back. Maybee there's a reason that I'm getting no responce but I'm thinking it's doubtful.

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06-02-2009 01:13 PM  9 years agoPost 12
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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someone would check the voltages before they ship it to avoid problems.
Yes, he should have shipped it at lest 70% charged. Anyway hope this gets worked out but it doesn't sound hopeful.

By the way, tlankford01 has not posted on here for 43 days.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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06-02-2009 01:28 PM  9 years agoPost 13
red_z06

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Dumont, NJ

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Only time 3.3v per cell is ok is when you intentionally drain at low C ( <1C ) for capacity drop and health checking. Because there is almost none at the end, I do the initial capacity check to 3.5v instead of 3.3v.

If it was brought to this voltage under a flight dischage rate, it would be pulled below 3.3v under load and the pack would be stress hard to push out every bit of electrons and heat up more toward end. It is more like squeezing out the last bit of toothpaste from a tube rather than last cup from a water cooler.

After checking, you either bring it upto storage voltage of 3.8-3.9v per cell or charge it full for use.

So, seeing it at 3.3v for a pack that is for sale shows signs of neglect. It was probably dischaged in use (high c) rather than controlled dischage through the charger.

If you are using same 80% rule that you used in the beginning to an aging pack, most likely you are stressing the pack more than you should. As the # of cycles increase, the pack will lose capacity. So, to be safe, you should perform a health check every 30-50 cycles to determine actual 80% for the pack.

For example, if a new pack has 2ah, then 1.6ah would be the safe discharge. But, as the pack age, you might end up with 1.8ah capacity. In this case, you should adjust your 80% dischage to 1.8-0.36 or 1.44ah.

www.JustinJee.com

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06-02-2009 05:13 PM  9 years agoPost 14
what_the_helli

rrKey Veteran

cookeville, tn USA

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If it was brought to this voltage under a flight dischage rate, it would be pulled below 3.3v under load and the pack would be stress hard to push out every bit of electrons and heat up more toward end. It is more like squeezing out the last bit of toothpaste from a tube rather than last cup from a water cooler.
great analogy Red!

I put the fun in dysFUNctional :)
Team KBDD & Funding by TnPrintMasters.com

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06-09-2009 04:54 AM  9 years agoPost 15
BOBBY1017

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PETALUMA, CA, USA

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So what do you guy's do when you get ripped off?

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06-09-2009 04:59 AM  9 years agoPost 16
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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Did you check his feedback before dealing with him? If you did, why didn't you insist upon receiving product before making payment?

EDIT -- I see now that you only read the first page of it.
what do you guy's do when you get ripped off?
If you payed via PayPal, file a claim with them. If you paid with a postal Money Order, see your Postmaster. If you paid with a CC, protest the transaction.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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