RunRyder - Storing batteries over the summer?

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e-Electric Batteries & Chargers > Storing batteries over the summer?

Ford Rollo
Senior Heliman
Location: Surprise, AZ

I need advice from someone who knows batteries. I have several li-pos that I won't be using over the summer. Temps here reach 110 on a regular basis. So I've purchased a mini-fridge to store the batteries. The maximum temp this fridge will register is 48 degrees F. Do you think this is too cold for 6 months storage?

Thanks in advance for your replies.

Ford

450 SE V2 and 600N Pro

04-21-2008 10:29 PM

PilotDaz
Veteran
Location: Seattle, WA

Send them to me, I'll store them in my heli if you're not using them

~Team Collective Mayhem

04-21-2008 10:45 PM

Rob_T
Elite Veteran
Location: Tualatin, OR - USA

Just don't freeze them! 48F is fine for storing them.

If you don't use the refrigerator, just making sure to store at 50% charge will make a big difference compared to full.

Rob
Eco8, Piccolo Fun, Shogun, HB Elite CP, Trex 450XL CDE, Swift

04-21-2008 11:01 PM

Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

DO NOT STORE LIPOS IN FRIDGE...it will kill them.

think about this...
once you remove from fridge the temp difference can create condensation...a no no in electricity.

>Store the cell in a dry location between –20°C and 30°C.

>Keep out of direct sunlight.

>When storing for an extended period, store between 10°C to 30°C
Store at 40% of capacity.

How long will it hold a charge?

Typical self discharge rates:
Ni/MH cell(Toshiba.) : 5 ~ 10%/month
Ni/Cd cell(Toshiba.) : 25 ~ 30%/month
Li-ion battery : 2%/month
Lead-acid Battery :
Pb-Sb alloy group : 25 ~ 30%/month
Pb-Ca alloy group : 2%/month

other resources

www.rcbatteryclinic.com

www.batteryuniversity.com

<><>...the lunatic is in my head...<><>

04-21-2008 11:32 PM

HOMEPAGE

pgoelz
Senior Heliman
Location: Rochester MI

Quote
DO NOT STORE LIPOS IN FRIDGE...it will kill them. think about this... once you remove from fridge the temp difference can create condensation...a no no in electricity.

Not really true for batteries with no electronics on/in them. The inside of a refrigerator is in fact a fairly dry environment since the dewpoint is at or below the internal temperature. For that reason, the moisture content is actually pretty low compared to room temperature. Any condensation that forms on the packs when they are removed is transitory and probably not present long enough to cause electrolysis or other bad effects. If this is still a concern, simply store them in a ziplock bag and don't remove them until they have warmed up.

I have been researching LiPo storage myself and from what I can determine from manufacturer's datasheets, storing at cold temperatures above freezing is not harmful and in fact (mostly) negates the detrimental effects of storage fully charged. Even better would be to refrigerate AND store 50% charged. For me, storing partially charged isn't logistically practical during flying season.

I too have purchased a small refrigerator and am storing my packs in their ammo can at about 35 degrees F when not in use. I leave the ammo can open in the fridge for a day or so and then close it after any excess moisture has had a chance to evaporate. When removed from the fridge, the top stays closed until the can and contents have warmed up.

Paul

Paul Goelz
Rochester MI USA
http://www.pgoelz.com

04-22-2008 05:40 PM

HOMEPAGE

electricdurango
Veteran
Location: Sterling, VA

Sell them now. Get new ones when your lipo flying resumes. Cheaper in the long run. You will get newer higher C rated lipos.

450se v2

04-22-2008 07:16 PM

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e-Electric Batteries & Chargers > Storing batteries over the summer?

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