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Old Mar 24, 2011, 04:26 PM
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Beaumont tx
Joined Oct 2004
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drain lipos?

What's the best way to drain LIPOS to 50% for storage?

howell
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Old Mar 24, 2011, 04:37 PM
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Joined Feb 2011
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get a 30$ charger that has a storage program?
or use a lipo tester and something that pulls A (motor...lamp...)
and discharge to 3.7v
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Old Mar 24, 2011, 05:24 PM
who dares wins
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London,England
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Have a few short flights before you go home
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Old Mar 24, 2011, 05:44 PM
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United States, NJ, Frenchtown
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MANUAL discharging is VERY RISKY for some of us. We forget to check every...each... cell every minute to make sure it does not go under the 50 % point. Long term under 50% does shorten the life of the battery. That is a real good number to use.

Some of us DO forget it is still being discharged if we get a call or visitor. ME !

FMA cell pros are very good fully automatic units.
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Old Mar 24, 2011, 05:46 PM
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Remembered.

I went to sleep & woke up next morning. Left it on charge all night.

FMA COMPLETLY shut off all the charging. SWEET.
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Old Mar 25, 2011, 10:18 AM
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Beaumont tx
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Thanks

howell
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Old Mar 25, 2011, 07:32 PM
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United States, MI, Macomb
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I have a charger that will do the discharge for me but it takes awhile to complete. I will never leave a charger unattended even if I am discharging. So, I will some times plug my batts into a automotive light bulb. I then set a timer, that is load enough for me to hear, for about 10 mins. Check the batt with a multi tester. If it needs more time just reset the timer.
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Old Mar 25, 2011, 07:45 PM
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Joined Apr 2007
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So if youre not going to fly for couple days you guys discharge to 3.7?

How many days we talking?

What if youre gonna fly early in the morning. Do you charge the night before or just wake up extra early and put the batt on the charger?
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Old Mar 26, 2011, 03:37 AM
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Letchworth, Great Britain (UK)
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Everything I've read suggests that the reason for storing a LiPo at 3.85v is to reduce the risk of it self-discharging to below 3.0v or some lower value. So far as I can see, if you can be sure it's not going to go below 3.0v, you can benefit by storing it at lower than 3.85v.

Since I time my flights I know I've got at least 20% remaining at the end of a flight, so I just leave my packs like that until I need them again, assuming I'll be using them within two or three weeks. I've just checked one of my 6S packs that I flew last Sunday and, as it happens, it's currently at 3.83v per cell. Last week I checked a 4S pack that I charged to storage voltage last August, and it's still showing 3.85v per cell, so self-discharge doesn't seem to be a major problem -- at least, not with good named brands of cells (FlightPower and ThunderPower in my case).

I charge as near flying time as I can, but often that's the night before.
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