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Old Aug 08, 2012, 08:20 AM
Obeying the law of gravity
Jeremy Kamutzki's Avatar
Canada, ON, Cambridge
Joined Jul 2011
494 Posts
Help!
Error on thunder ac680

Hi, recently i've got the same error on a couple different batteries. I use a thunder ac680. It gives me the error "battery vol err,cell low vol". I've got this only with high discharge nanotechs. One in my mini e revo vxl and one in my rcgroups super slo. So, my question is, how do I fix it and what exactly does it mean? The manual doesn't have that exact error code.
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Old Aug 08, 2012, 08:50 AM
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It seems to be saying that one or more cells has an overly low voltage. You can confirm that with a cell checker or a DVM to see if it's the battery packs or the charger that has issues.

Generally chargers don't want to charge very low cells for safety. 3V per cell is probably the typical cutoff.
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Old Aug 08, 2012, 11:23 AM
Southern Pride
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Haralson County GA. USA
Joined Oct 2004
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One of the many helpful Sticky Threads

http://www.rcgroups.com/forums/showthread.php?t=1074181

Sound like you flew to long / hard and over discharged them. The stronger tyhe battery is the easier it is to do this. You should try not to use more than 80% of the LiPoly's capacity

Each cell should be around 3.7 V after the flight or for a 3S 11.1Volts.

Charles.
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Old Aug 08, 2012, 11:53 AM
Obeying the law of gravity
Jeremy Kamutzki's Avatar
Canada, ON, Cambridge
Joined Jul 2011
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This is a 2s on my plane and the cell voltage is 3.45v. Shouldn't it still charge it if its not below 3v?
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Old Aug 08, 2012, 03:35 PM
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That's awfully low, (very bad for the battery) though some chargers will probably charge a cell that low.
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Old Aug 08, 2012, 03:40 PM
Southern Pride
everydayflyer's Avatar
Haralson County GA. USA
Joined Oct 2004
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Quote:
Originally Posted by Jeremy Kamutzki View Post
This is a 2s on my plane and the cell voltage is 3.45v. Shouldn't it still charge it if its not below 3v?
You should have not discharged a 2S below 7.4 volts (3.7 per cell).

If the total voltage of both cells is 3.45 then you should just discard it.

If onbe cell is 3.45 and the other is above 3V then you may be able to save it but it will never be all that great as it has been seriously damaged.
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Old Aug 08, 2012, 04:42 PM
Obeying the law of gravity
Jeremy Kamutzki's Avatar
Canada, ON, Cambridge
Joined Jul 2011
494 Posts
I meant individual cell voltage is 3.45V. My LVC on my ESC just goes up to 3.0V/Cell. This was my first flight with this battery, and the plane. It's a 300mah nano-tech. How can I ensure it doesn't go to low?
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Old Aug 08, 2012, 05:54 PM
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Fly with a timer. Most transmitters have them. If not, a kitchen timer will do.
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Old Aug 08, 2012, 06:44 PM
Obeying the law of gravity
Jeremy Kamutzki's Avatar
Canada, ON, Cambridge
Joined Jul 2011
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Yeah, I have one on my dx6i. Because it was my first flight, I was using a count up timer to find out how long it lasts.

I always heard that 3.0v/cell is absolute minimum, so I thought 3.5v/cell is ok. Its only 0.2v lower than 3.7

Anyway, what's my best bet for reviving it?
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Old Aug 08, 2012, 06:47 PM
Southern Pride
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Haralson County GA. USA
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See link I posted in post #3
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Old Aug 08, 2012, 09:40 PM
Obeying the law of gravity
Jeremy Kamutzki's Avatar
Canada, ON, Cambridge
Joined Jul 2011
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Ok. But most of those are for batteries with cells below 3v. Mine is well above, so is it a setting on the charger to change the voltage it will charge?
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Old Aug 08, 2012, 10:23 PM
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Start with a short count DOWN timer and work up based on the mah put back in. 3.5V is way too low. See the My battery is dead link above for ideas on how to recover it. Be careful.
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Old Aug 09, 2012, 09:30 AM
Obeying the law of gravity
Jeremy Kamutzki's Avatar
Canada, ON, Cambridge
Joined Jul 2011
494 Posts
well, I recovered it by just charging it, not balancing it. I brought it up to 7.4V and now am balance charging it for a full charge. Next time I will check the voltage every little while and determine how long I can safely fly.

So you guys are saying that after I'm done flying/driving my car, the voltage for each cell should be 3.7V or higher? If so, why do the LVC cut it off at 3.0V/Cell? and I hit cut off, by the way and the cell voltage was 3.45/cell. Does the voltage rebound after there's no load on it?
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