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Old 05-16-2014, 04:50 PM   #1
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Lipo discharge?

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I charged 3 batteries ready to fly and it poured with rain, I likely won't get to fly until next Wednesday. So should I discharge the batteries and if so is it better for the battery to stick them in car and run them down or discharge them through my charger?
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Old 05-16-2014, 07:07 PM   #2
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Re: Lipo discharge?

When batteries are left at a full charge, the internal resistance goes up over time. When resistance goes up, the battery won't have as long of flying time, and heat up easier.

Discharge the batteries thru the charger, make sure it has a voltage cut-off for a storage charge.

Hope this helps. Daren
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Old 06-02-2014, 09:14 AM   #3
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Re: Lipo discharge?

My charger's storage mode puts each cell at 3.79/3.8 (3s). Is that too low? There is no way to change it.
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Old 06-02-2014, 09:39 AM   #4
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Re: Lipo discharge?

3.8V per cell is a common storage voltage for lipos.

In the delayed flying scenario, I sometimes take the batteries down to 3.9V for a couple of days then back to full charge before flying (Not a big difference, but saves a little effort on both ends).

The wear on the battery increases as you hit the top end of 4.2V per cell, which is why you want to be there only as long as you need..
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Old 06-04-2014, 12:07 AM   #5
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Re: Lipo discharge?

For 5 days you could keep them in a cool place but a safe place. According to this you would lose a little over 1/10 of a % or .125% for the 5 days if kept at 0*c. Left in a hot car for the week, 25*c you would lose .42%.
Even if discharged to storage charge and stored at the right temp your still going to lose .04% at 0*c and .08 at 25*c.
As you can see 5 days is not going to do a lot of harm.

Even leaving them fully charged as long as they are not on the dash of your car in the sun, kept close to 0*c will only lose you 6% in a year where at 40% charge is 2%. A difference of only 4% in a year. If packs last on average 2 years then some might even question worrying about keeping them fully charged all the time.
Temperature looks to be more important then state of charge.
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Last edited by MikeCam; 06-04-2014 at 12:13 AM.
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