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Jul 09, 2018, 02:46 PM
Launch high. Fly low.
Discussion

Too hot for lipo!?


I have 5 of the 600mah graphene lipos that Iíve been the past year. After yesterdayís contest at Poway in 1,000,000degrees, all my lipos are puffy!!! Da heck?! Well, it was more like 105degrees but it felt like a million. Lol
Trash, yes?

Any replacement recommendations?
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Jul 09, 2018, 04:15 PM
Afflicted with DDD
Soarhead00's Avatar
Jun
I'd be surprised if 105F was the cause of your problems with puffing batteries. I know that the batts used for powering motors get much warmer during normal service. This thread:
https://www.rcgroups.com/forums/show...-hot-for-lipos
recommends 105F to 115 for lipo temps. Maybe Graphene batteries behave differently than regular LiPos.

I may be wrong here but I'm always willing to learn something new.
Bob
Jul 09, 2018, 04:20 PM
Registered User
clintc's Avatar
My gum stick packs all eventually puff a little. Not sure if heat plays a roll there or not. A couple of mine that are only 6 months old started puffing recently too. But they are so cheap I usually wait for the capacity to drop (how long I can fly before < 3.7v) before I replace them, even if they have puffed a little.
Jul 09, 2018, 04:29 PM
Registered User
where were these batteries when it was 105 ? Remember the trunk or interior of your car could be much hotter.
Jul 09, 2018, 04:46 PM
a.k.a. Bob Parks
It was 111 F in AZ this weekend per the wx service, and probably hotter in some locales.

My batteries live in my garage, which was probably hotter than that when my wife's car gets parked in it. They all do fine, some stored fully charged and others at storage charge. I have a couple of 2200 3 cells, lots of single cell 600 & 900 rounds and a few newer 800 & 1200 LiFe types.

In the early days my research said LiPO's like to be hot and are more efficient at higher temps, so I did not worry about them.

BP
Jul 09, 2018, 05:03 PM
Launch high. Fly low.
They were in an open radio case under shade yesterday. They usually sit in a coffee mug, in a metal battery box in the garage. It doesn't get hot in there.
I used two batteries yesterday and all of them are puffed.

I guess I'm getting new ones. I have to get these again coz they fit perfectly. Are there similarly sized batteries out there?
Jul 09, 2018, 05:16 PM
Registered User
clintc's Avatar
I’ve been using these. I can usually find them at the local hobby shop

https://www.horizonhobby.com/500mah-...ade-p-kxsb0008
Jul 09, 2018, 05:36 PM
Come out swinging
sporter's Avatar
Yup, me too. Those 500s are pretty cheap.

Sean
Jul 10, 2018, 08:58 AM
hot air rises...
jfinch's Avatar
IME, the gumstick's all puff within 6-8 months. I blame the cheap usb chargers. But the batteries are cheap enough that I just keep a few on hand and replace as needed.
Jul 11, 2018, 02:08 AM
Rusty
Rusty Nail's Avatar
LiIon batteries do not like being hot.
At sustained temperatures above 30C they start to develop dendrites that degrade cathode performance.

https://www.nature.com/articles/srep12967
Jul 11, 2018, 09:52 AM
Registered User
My gum stick cells puffed slightly after I flew longer than I probably should have. I didnít have voltage telemetry at the time. Iím about to start using these and plan not to go below 3.7v https://hobbyking.com/en_us/turnigy-...mqx-120sr.html Weíll see what happens.

Joseph
Jul 11, 2018, 10:18 AM
Registered User
Recently, I’ve been reading way too much about battery temperature management in EVs (Just bought an Outlander PHEV)...

One of the advices to mitigate Liion degradation in hot temperature is not leave it fully charged. So if there are 5 spares cells, probably the best practice would be leave 3 of them at 50% of SOC (state of charge).

YMMV (literally),

Tai
Last edited by tai626; Jul 11, 2018 at 10:25 AM.


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