Charger "Lipo dishcarge" feature goes to 3.0V per cell? - HeliFreak
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Old 04-02-2009, 07:34 PM   #1 (permalink)
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Default Charger "Lipo dishcarge" feature goes to 3.0V per cell?

OK.. cycling my new 3300's a couple of times... "Lipo storage" wants to go down to 3.8V/cell and "Lipo Dishcharge" wants to go down to 3.0V/cell.

Isn't 3.0V too low? Or is that considered an empty Lipo (but still safe)
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Old 04-02-2009, 07:41 PM   #2 (permalink)
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3.0 V / cell would be an overdischarge. I would not want to go lower than the nominal voltage of the cell ( 3.7 V ).

Keep a close eye on those Turnigy's.
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Old 04-02-2009, 08:08 PM   #3 (permalink)
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Thanks UV Sounds like a plan. I'll stop them at 3.7v and charge to full again. I wonder how many cycles I should do before flying the new lipos? Anyone?

EDIT: I keep forgetting there is a battery forum on helifreaks.. I best be off there.. no doubt all these questions are common.
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Old 04-02-2009, 08:32 PM   #4 (permalink)
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Why don't you cycle them with some short easy flights?
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Old 04-02-2009, 08:55 PM   #5 (permalink)
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thats what i want to do, in normal mode with throttle at like 50 just hover for a few minutes for the first few cycles.....would that be ok?

Thanks, Daniel
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Old 04-02-2009, 09:05 PM   #6 (permalink)
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Quote:
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thats what i want to do, in normal mode with throttle at like 50 just hover for a few minutes for the first few cycles.....would that be ok?

Thanks, Daniel
That would be great.

There's really no reason to loose a few cycles to cycling.
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Old 04-02-2009, 10:53 PM   #7 (permalink)
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Sounds good. I'll just cycle all 4 lipos just one time.. and then do some easy flying for a few minutes each... so I can at least some flight time on their 2nd cycle.
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Old 04-03-2009, 04:47 PM   #8 (permalink)
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Quote:
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3.0 V / cell would be an overdischarge. I would not want to go lower than the nominal voltage of the cell ( 3.7 V ).

Keep a close eye on those Turnigy's.
What? 3.7v? I don't think that sounds right. Isn't 3.2v more of a safe low limit for LiPos? 3.0v is borderline.
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Old 04-03-2009, 05:22 PM   #9 (permalink)
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I don't know. I just know I always fly until the resting voltage is 3.8V per cell.. maybe 3.7V.

I bought one of these... this should help.. friends got one and it's REALLY cool.

http://www.hobbycity.com/hobbycity/s...idProduct=6232
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Old 04-03-2009, 05:44 PM   #10 (permalink)
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They make smaller similar units like the blinky balancer which essencially do the same thing. but for about 30 bucks, you get a reading to the 100th decimal, unlike to the thousands like this one.
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Old 04-03-2009, 05:45 PM   #11 (permalink)
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as far a s i know it is safe to discharge to 3v,if the charger is accurate it should not be a problem.
have not heared abut any lipo that would get damaged with a discharge to max 3v or charged to max 4.2
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Old 04-03-2009, 05:54 PM   #12 (permalink)
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Quote:
Originally Posted by Slyster View Post
I don't know. I just know I always fly until the resting voltage is 3.8V per cell.. maybe 3.7V.

I bought one of these... this should help.. friends got one and it's REALLY cool.

http://www.hobbycity.com/hobbycity/s...idProduct=6232
if u want to get max out and want to be safe i would recomend lipodimatic to monitor each cell in the pack during flights. it makes sure no cell will drop to much under load.

i use them in all my helis. still fly with timer but some times when i fly harder then normal it is a grate insurance not to drain the pack to much
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Old 04-03-2009, 06:23 PM   #13 (permalink)
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3.0 to 3.2 v/c is basically the standard for MAX safe discharge of a lipo. I never run mine below 3.7v/c when flying. To cycle them, I fly mild flights and cut my timer in half. Usually 2.5 to 2.75 min. and cycle 5 times, then let it rip. That's about what I have read over the years, with slight variations, but I have never had any problems with my lipos either. Hope you enjoy the 500, know you will.
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Old 04-04-2009, 07:58 AM   #14 (permalink)
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I think 50% power would be too little for safe hovering. My buddy Nate had a great idea for breaking in new packs. He suggested setting a throttle curve for 50% at midstick and just let it sit on the ground for 5 to 10 minutes depending upon how much you want to discharge it.

An option would be to throw the packs in a plane and do some leisurely flying for about 10 minutes. I didn't have the patience to do either, I just threw the packs on the heli and went for it. Granted I'm using $18 Zippy's. If I spent $80 per battery I'd probably break them in properly.
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