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Electric Stunt => Gettin all AMP'ed up! => Topic started by: Matt Piatkowski on July 21, 2021, 10:14:36 PM

Title: Storing LiPo to 3.85-3.86 Volts/cells
Post by: Matt Piatkowski on July 21, 2021, 10:14:36 PM

Hello,
I am forced to use the charger that stores LiPo to 3.85-3.86 Volts/cells.
This number cannot be lowered to 3.81-3.82 v./cells that is generally considered the storage voltage.

Is there any negative effect of storing LiPo having a slightly higher storage voltage?

I am using TP 6S 2800mAh 25C. These batteries will be in constant use until November 2021. Only when the weather is bad, I will have to store them, say, for 3-4 days. Otherwise, I will be flying each day.

Regards,
M

Title: Re: Storing LiPo to 3.85-3.86 Volts/cells
Post by: PerttiMe on July 22, 2021, 01:46:05 AM

Those numbers are close enough. And your storage periods are so short that EXACT voltage is even less critical.

Title: Re: Storing LiPo to 3.85-3.86 Volts/cells
Post by: Ken Culbertson on July 22, 2021, 06:08:24 AM

Quote from: Matt Piatkowski on July 21, 2021, 10:14:36 PM

Otherwise, I will be flying each day.

If only..... H^^

Have you considered a second inexpensive charger just for storage?  I had one and took it to the field for those days that you just had to fly one more time.  I also doubt that the small difference in voltage over that short period will damage the battery.  I flew two sets of 4 weekly and I would leave them at the "post flight" voltage till the next weekend.  Only ones I would draw down were the ones I didn't use.  Both sets were still good after almost 2 years.  Probably not the best battery discipline but it worked for me.

Ken

Ken

Title: Re: Storing LiPo to 3.85-3.86 Volts/cells
Post by: Fred Underwood on July 22, 2021, 11:36:05 AM

CellPro PowerLab 6 and 8 use 3.86v for storage cutoff, but that voltage falls a bit the first hour.  PowerLab is generally regarded as one of the top chargers, so probably a reliable number to use.  You can also select a different voltage if desired, on PL's.  Does it stop at 3.86v while charging?  If so, what is the voltage and % charge after an hour? 

http://www.revolectrix.com/support_docs/PowerLab_8_users_guide_v2_r3%20082211.pdf

I have seen various voltage numbers recommended that equate to about 40 - 60% charge for storage.  The % changes quite a bit for a very small voltage change in that voltage range. 

Title: Re: Storing LiPo to 3.85-3.86 Volts/cells
Post by: PJ Rowland on August 20, 2021, 01:45:34 AM

You can also select a different voltage if desired, on PL's

This is what I do. Run a few cycles to get an accurate fuel table then set it higher.

I prefer to storage charge at 60%.( 3.87V)  The damage will be done doing either of the following. Leaving it full or leaving it too low the voltage drops below a level where you wont revive it.

Slightly higher is better than slightly lower..