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LiIon, LiPo, NiCd & NiMh General General Battery Support |
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08-08-2014, 12:59 AM | #1 (permalink) |
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Join Date: Sep 2013
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Lipo packs… How hard do you fly 'em?
I typically fly my packs to 3.75 to 3.77V/cell, measured immediately after flight. (They'll usually bounce back to 3.78-3.80 respectively after sitting for a few minutes)
When I charge them, I end up putting about 65% of capacity back into them. I know that in theory, I can pull out 80% of capacity, but that seems to equate to be near the 3.70V mark. How far do you all take your packs, volt-wise? What's MAH percentage of capacity does that equate to in your packs?
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08-08-2014, 07:59 PM | #2 (permalink) |
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This is hardly scientific, but I'll give you my experiences.
My packs are always stored around storage voltage, ~3.8-3.85V. Over the winter, they are storage charged then stored in the fridge. I charge them before I go fly. When field-charging, I'll charge at 3C. I used to charge at 1C exclusively, now I'm often charging at 2C at home. I have (4) Gens Ace 6S 1200 30C packs for my 450. They have about 2 seasons on them, 190 cycles each. They are still doing well as far as I'm concerned, though one pack now needs to be retired. It has one cell that ends up around 0.1V lower than the rest. Balance charging it individually doesn't change anything. So out of my 24 GA cells, 23 are holding up well. I charge these packs to 4.18V/cell, not 4.2V, as lower charge voltages are supposed to be a little easier on packs. I run them to about 3.78-3.8V, and put back around 50-55%. If I was charging to 4.20V, the charge %'s would be maybe 2-3% higher. I have (3) Pulse Ultra 6S 4100 45C packs for my X5. They have 55 cycles, and are also run down to about 3.8V. I put back around 55%. I only charge these to 4.15V. This is about 5% less capacity than 4.2V, so I believe they'd show about 60% if I charged to 4.2V. I'm in the process of adding mAh-used telemetry sensors to my helis. Once they're set up, I may start draining the packs a little further, since I know I'll be able to typically extend my flight times, without accidentally over-discharging the packs if I'm flying hard.
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08-09-2014, 12:33 AM | #3 (permalink) |
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Join Date: Sep 2013
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Thanks for sharing your experiences. Seems pretty on par with mine for how the mah equates to voltage.
I typically charge at 2C, but sometimes 1C if I have time. I haven't gone above 2C yet, and I'm fairly certain that my charger cuts out at around 95%. My cells are alwYs 4.17 - 4.18v when they come off the charger, even though it says 4.20 as the instant reading when it cuts out. I'd just like to see how hard I can push them without ill effect outside of standard wear and tear.
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08-09-2014, 07:21 AM | #4 (permalink) |
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Join Date: Jan 2013
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Lipo packs… How hard do you fly 'em?
If you go easy on them, they'll last longer, I'm sure.
I have some packs that are about 100 flights old (varying brands, doesn't matter, they are aging similarly) for my mini protos that I fly hard and have a 3:20 timer on. I frequently charge at 3C. Recently I have had to lower my timer to 3:00 after trying a bigger pinion. Now I have a couple packs coming down piping hot with a low voltage alarm on my Castle esc. Some cell voltages are resting at 3.2 while others are at 3.65. I haven't retired them yet, bit I'd bet parallel charging packs in this condition is unwise. Packs will not last forever. It is up to you how to treat them. For me, I don't worry too much about a $35 battery.
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08-25-2014, 10:19 AM | #5 (permalink) |
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Join Date: Jan 2014
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Depends on the pack. The 100+ dollar packs for my HD Cell 500 I treat with respect. The 20-30 dollar packs for my 450L I abuse. I regularly run those packs down to 3.65, and I burn over 90% of the capacity each time. That's 4 minutes of smacking it.
Those 450l packs now have over 35 cycles (3 packs, at least 35 cycles each) and I charge them at 3c. They all have fairly low IRs still, with one being higher than the others. (two pulse packs have IR's of around 7 per cell, the one align pack is higher. But again, I'd never treat my expensive packs that way. My point is that what most people consider to be abusive probably isn't as bad as common wisdom would say.
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