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LiIon, LiPo, NiCd & NiMh General General Battery Support


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Old 04-12-2012, 12:28 PM   #1 (permalink)
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Default Lipo Discharge

I am using a Hyperion EOS0606i charger and I was wondering why it takes so long to discharge my Eflight 11.1 2200 mAh battery's for my Blade 450. The setting is what the book says for this battery. ??
I know they were fully charged ( havnt used the Heli in days,,,too windy here) wanted to make sure I didnt ruin the new batteries. (I have 5 of them)...So I read to discharge them.
Im new to this so it may be quite normal....any help would be appreaciated!!
Thanks
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Old 04-12-2012, 04:21 PM   #2 (permalink)
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My charger will only discharge at 1A. That's only just over 6C on a 160 mAh... for your 2200 mAh it would take about 2 hours and 12 minutes from a full charge. What C rating is your battery? What amperage are you discharging at?

My manual for the charger tells me to discharge @ 1C BTW. The manual plays it ridiculously safe. I discharge at the full 1A and if the charger would allow I could discharge @ up to 4A (25C) since that's what my battery is rated for.
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Old 04-12-2012, 04:23 PM   #3 (permalink)
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With larger packs (I use 6s5000mah) I use these

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Old 04-12-2012, 04:26 PM   #4 (permalink)
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BRILLIANT!!!!!



What's the risk of running them too low by that method though. That's the only thing I'd worry about.
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Old 04-12-2012, 04:27 PM   #5 (permalink)
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Yes they are very bright when discharging.

Takes 25 minutes or so to get a full 6s5000mah to storage level. Better than the HOURS on a charger.

You got to watch/time them though.. if you forget.. your going to kill your pack.
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Old 04-12-2012, 04:29 PM   #6 (permalink)
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Chargers have very limited discharging capabilities because the only way they can discharge it to convert the energy to heat. Also people underestimate just how much energy is in even a small lipo. Add those two together and it makes for LONG discharge times. Here is a little math for you.

A google search showed me this about that charger "0.1A - 1.0A Selectable Discharge Current (5W max)". Knowing that it has a 5W max discharge, lets see how long it will take to discharge a 3s 2200mAh pack

A 3s 2200mAh pack is actually a 11.1V, 2.2Ah pack. The Ah rating means that it will output 2.2A for an hour before it is depleted. That equates to 24.4W, or 2.2A * 11.1V, or nearly 5 times the max discharge capabilities of that charger. So it would take 5 hours to discharge that pack fully on your charger. Now assume you want to discharge it to 50% for storage, it would take approx. 2.5 hours to do so. Make sense?

If you need more, look into making one of these.
http://www.tjinguytech.com/charging-...ight-bulb-load
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Old 04-13-2012, 07:44 AM   #7 (permalink)
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Its a 3 C and yes it is discharging at 1 A ( max setting) and it is taking about 5 hrs from a full charge using the discharge setting. I have 5 batterys,,,thats a long time.!!!
Thanks
Dan
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Old 04-17-2012, 07:45 PM   #8 (permalink)
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i use 3 x 100w 24v car lights wired in series to discharge my 6s 3300 packs if i need to.
with this method im putting a 12.4amp load on the pack and its down to 3.8 in 13minuites roughly.
i made the light harness up to break my new packs in, thunder power reccomend a 3-5c run in for the first few cycles and this gives me 4c give or take a little
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