Bought a couple 4000mah 6S 45A (Molicel) LI-ION pack. Its still cold winter.
How cold is too cold for flying LI-ION? Should i wait for warmer weather?

Reason i ask is i read that LI-ION dont like cold?

I have a heater bag for my LiPo/Li-on packs and that makes a considerable diifference, but then I'm not doing long duration, when "in use" chilling would matter more.

However, pre-warming adds roughly two minutes to my 4S 1800mAh LiPo packs used for freestyle. Newish packs increase from 5min 30s up to either side of 8 mins.

A flying buddy made his own from a cool bag with telescope heater (I bought the ETHIX unit) and has gained similar results.

(25-Feb-2022, 07:13 PM)BadRaven Wrote: I have a heater bag for my LiPo/Li-on packs and that makes a considerable diifference, but then I'm not doing long duration, when "in use" chilling would matter more.

However, pre-warming adds roughly two minutes to my 4S 1800mAh LiPo packs used for freestyle.   Newish packs increase from 5min 30s up to either side of 8 mins.

A flying buddy made his own from a cool bag with telescope heater (I bought the ETHIX unit) and has gained similar results.

Thanks, yeah keeping them warm before flight is a good idea. I fly lipos but i am new to li-ion so i dont know what to expect in terms of how they will behave with cold. Someone said he flies lipos in the winter as they handle the cold better than the li-ion. Mayby its because the li-ion is in different package individual cylinders. On the other hand a youtube named falconrad flies his li-ions in the Canada winter mountains for 20min seemingly without problems. Guess i can try over safe ground and see how long they last.

Depends on your flight usage, if you are just cruising then motor load will maybe not keep the pack warm and duration will drop.

As I fly reasonably aggressive freestyle, a pre-warmed pack stays warm during flight despite wind chill.

Nothing to stop you sleeving the cells into a more cohesive "pack", then prewarmed they'd maybe retain enough temp.

(25-Feb-2022, 07:38 PM)BadRaven Wrote: Depends on your flight usage, if you are just cruising then motor load will maybe not keep the pack warm and duration will drop.

As I fly reasonably aggressive freestyle, a pre-warmed pack stays warm during flight despite wind chill.

Nothing to stop you sleeving the cells into a more cohesive "pack", then prewarmed they'd maybe retain enough temp.

I like fast crusing at around 55mph so hopefully that will be enough otherwise i might do as you suggested and make a sleeve the pack to make it contain the heat from the cells. I am very happy i also got help in another thread with a current sensor issue. My current-sensor was malfunctioning, it was a bent pin. This forum is awesome!