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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Discharge Lipos for Storage
10-29-2006 11:56 PM  12 years ago
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cwright

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Blossvale New York

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Discharge Lipos for Storage
I have a Triton charger and I am thinking on dischrging my TP 2100 3S packs to about 3.7 volts per cell. Would this be OK to do? I have heard that you shouldn't store them at pull voltage for long periods of time. Would discharging them at 5 amps be ok seeing they are 15c packs? Also would I use my TP balancer when I discharge them? Thanks for your help. Chuck
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10-30-2006 12:37 AM  12 years ago
Boidman (RIP)

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The Home Stretch

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Between testing and reading, I believe that 2100 3S packs should be stored at between 11.3 to 11.7 volts, with a mild tendency towards the higher end of that range. I store my batteries at around 45-50 degrees F, and they have a very slow diminishing capacity over many cycles when compared to other storage methods. I choose to minimize use of and heat in electronics - a 5 amp discharge rate will run the triton's fan continously and heat it up to almost untouchable at the rear heat sink. I suggest discharging at 1 or 2 amps max. Consider plugging in the balancer after you have reached the voltage you choose, and if neads be, you can bring the pack back up to the desired voltage.

Li-Po's are nifty little beasties - treat them well and your wallet and helicopter will moan quietly with satisfaction.
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10-30-2006 01:13 AM  12 years ago
Gary Jenkins

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Nowhere, US

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If you were going to store them half charged wouldn't you discharge 2100 ma packs till the Triton indicated a 1050 mA discharge? The Triton voltage reading depends on the load current.
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10-30-2006 01:54 AM  12 years ago
Boidman (RIP)

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. . . from Charlie, owner of Thunder Power who spent the
day at the field today.

Never fly the battery lower than 10v. This usually means that
unloaded you should never see below 10.5v after a flight . . .

Never store the batts longer than A DAY OR TWO on a full charge nor a full discharge . . .
However many milliamps were drawn to reach 10 volts, measured with a flight recorder during, or a 1 to 2 amp load after landing, could be halved to replenish the battery up to a storage state. I just choose to let the battery sit for a bit after the partial charge, before measuring the resting voltage.

Of the maybe 25 3S Li-Po's I have measured fresh off the truck at possibly only 1 or 2 days out of Thunder Power in Las Vegas, the average voltage has been around 11.6v. Between my testing and reading, and the belief that Thunder Power wants those batteries to be able to sit on hobby shop's shelves for as long as is reasonably possible with zero to minimum degradation, I have just chosen to use a voltage-only reference when my batteries are prepared to sit for longer than 2-3 days.

I realize that this all is not exactly traditionally conventional, but I swear that my packs actually softly giggle at me in a pleasant female pitch when I pull them from the 'fridge' in preparation for use. (No, I believe I'm just fine, why do youse ask? )
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