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[raywilb]

i have a battery operated tyre inflator that is kept in my boot . it will also work on a 12v supply. yesterday i had a warning that right rear needed inflation but the machine would not work on both battery or 12v supply although when switched on it did have a momentary attempt at starting. the battery was fully charged & 12v supply is ok. the outside temperature was well below freezing & i wondered if the coldness made it behave as it was because as when i took it indoors it started to work,

[Raeturbo]

I can’t work outside unless it’s 2c and rising

[YZ250]

Sometimes they just die. I took mine apart when it died and it had a tiny little piston in a tiny cylinder to create the pumped air. The piston had blown through the cylinder and jammed up. The fixer in me wanted to mend it but in the end I just chucked it in the bin. 

[raywilb]

Sometimes they just die. I took mine apart when it died and it had a tiny little piston in a tiny cylinder to create the pumped air. The piston had blown through the cylinder and jammed up. The fixer in me wanted to mend it but in the end I just chucked it in the bin. 

no its operating fine now.

[Andy H]

Probably caused by some grease becoming too stiff for the motor to start.

Once running they get pretty hot.

[raywilb]

Probably caused by some grease becoming too stiff for the motor to start.

Once running they get pretty hot.

i do believe you,ve hit the nail on the head Andy. since my post its been ok

[Marks DTM Calib]

Batteries are not good at low temperatures, LiOns for example you can't charge below zero degrees and they have a higher internal resistance so provide less current. Its the basics of chemistry, high temp equals better reaction

[78bex]

I knew I needed a reason not to buy a milk float 

[Doctor Gollum]

I knew I needed a reason not to buy a milk float 

They keep themselves up to temperature whilst on charge

[Raeturbo]

https://www.navitron.org.uk/forum/index.php?PHPSESSID=7r61u68mppu9o6v2h0kdhkrsk6&action=dlattach;topic=12250.0;attach=5966;image

[Raeturbo]

That’s for lead acid

[Marks DTM Calib]

I knew I needed a reason not to buy a milk float 

Charging and discharging losses warm the batteries, they also have heaters for extreme cold areas.............yet another reason why batteries of any form are not the ultimate answer (but bloody good fun)

[TheBoy]

In the recent cold snap, when I sent any of the drones out, I had to hover them for 2 or 3 minutes before trying to fly off, just to get the batt temps up to double figures, else the thing is liable to drop out of the sky once it gets into stronger wind chills.

[henryd]

In the recent cold snap, when I sent any of the drones out, I had to hover them for 2 or 3 minutes before trying to fly off, just to get the batt temps up to double figures, else the thing is liable to drop out of the sky once it gets into stronger wind chills.

My old 22v 6s Lipo's out of the 500 size heli would be too hot too hold after spirited use.

[TheBoy]

In the recent cold snap, when I sent any of the drones out, I had to hover them for 2 or 3 minutes before trying to fly off, just to get the batt temps up to double figures, else the thing is liable to drop out of the sky once it gets into stronger wind chills.

My old 22v 6s Lipo's out of the 500 size heli would be too hot too hold after spirited use.

I don't have too much trouble with overheating on any of my bigger batts, its the smaller ones for the fast stuff that I tend to cook.  But due to lockdown, I can't really use anything other than the DJI stuff, as I try to abide by the lockdown rules.

But that Kraton RC  car I've posted up vids of before, that takes 6S 6200mah lipos - small compared to your heli, but nigh on the biggest I have - will cook itself in 10mins or less.  Hence I'm usually looking for big puddles to cool it, the motor and the esc down partway through each run.

The planes are less of an issue, as you can guarantee airflow.  The bigger homemade drones I try to direct a small bit of the propwash over the batt (and vtx) in the hope Tesco are correct with their Every Little Helps.