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Be safe even when you charge tiny whoop batteries
#1
We all know that we should be careful when we charge lipo batteries. I use the safe bag for big batteries or just make sure to put them on hard and not flammable surfaces. However, I use a small charge to charge my 1S batteries, which is portable. I don't want to have my big safe bag around, so I use the following trick. I use a glass jar to keep batteries safe while charging them. It is small and beautiful :-)

I hope it helps to be safe!!!!



Let me know if you have other fun tricks to be safe!!!
#2
Yay shrapnel!
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#3
I have a ceramic floor tile that I charge on, and I charge outside on the balcony. I am renting a wooden house at the mo, so safe charging is a really big priority for me. Up till now I have only used 1S, I should probably invest in a safe lipo bag though, now I have got some 4S batteries on the way... Exciting times!
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#4
Nice idea Big Grin
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#5
(09-Jan-2018, 01:42 AM)JukeJoint Wrote: Yay shrapnel!
A couple of twists of duct tape around the jar will do the job imho
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#6
I just don't see the need for the risk. Lipo fires will melt glass..
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#7
(11-Jan-2018, 09:48 AM)JukeJoint Wrote: I just don't see the need for the risk. Lipo fires will melt glass..

Really? I didn't know that!
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#8
(11-Jan-2018, 09:48 AM)JukeJoint Wrote: I just don't see the need for the risk. Lipo fires will melt glass..

Even burning pure lithium metal will not exceed 1200°C in moist air. (See: http://www.dtic.mil/get-tr-doc/pdf?AD=ADA238154)

Glass melts between 1425°C to 1600°C depending on composition.

The FAA's own tests on lithium ion battery fires show that 1200°C was not exceeded. See: https://www.icao.int/APAC/Meetings/2015%...15_DGP.pdf

The only danger with using a glass container is explosive fracture of the glass due to large differences in temperature creating stress in the glass and causing it to shatter with significant force.
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#9
I originally thought the first post was a joke, maybe not? Charge on something that won't burn, outside preferably. Lipo fires are no joke.
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#10
(11-Jan-2018, 09:48 AM)JukeJoint Wrote: I just don't see the need for the risk. Lipo fires will melt glass..

It is impossible with these tiny batteries. 
These jars are so sick and their melting temperature is really high.
 I would not risk trying this on 1300mah batteries, but I would say it will not melt even with big batteries like 1300mah. However, for big batteries, as I would say use metal boxes or safe bags.
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#11
(11-Jan-2018, 04:12 PM)unseen Wrote: Even burning pure lithium metal will not exceed 1200°C in moist air. (See: http://www.dtic.mil/get-tr-doc/pdf?AD=ADA238154)

Glass melts between 1425°C to 1600°C depending on composition.

The FAA's own tests on lithium ion battery fires show that 1200°C was not exceeded. See: https://www.icao.int/APAC/Meetings/2015%...15_DGP.pdf

The only danger with using a glass container is explosive fracture of the glass due to large differences in temperature creating stress in the glass and causing it to shatter with significant force.
Thumbs Up 
thanks for the references.
That's the reason I use it for 150-300mah batteries. big batteries will not fit inside and if they explode they for sure make the scenario you indicated.
Probably this is gonna be a cool idea to try and post it as a youtube video for people who love to do experiment!
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#12
Okay, it wont melt, but it can become malleable. For a yokel like me they are one in the same Tongue
Like I said, it's just not a great idea ,imo, to be showing this as an option. I wouldn't want my kid doing this. Kids have the internet.
Just my thinking, ya know. Not trying to be a nancy boy..
I'm sure it's highly unlikely, but in the case of a fire, wouldn't a jar have the potential to be a rocket? lol Maybe not enough pressure..
I guess I'll have to wait for the youboob videos Tongue
I've looked up some pics of lipo fires. The smaller bags don't really do much. Sure they contain all the combustible material, but flames shoot out the sides. They don't really contain the fire. Interesting.
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#13
If you stood the jar on the open end, the sudden discharge of gas from a battery that enters thermal runaway may indeed propel the jar upwards! I agree that using a glass jar isn't a very good idea as a venting battery will crack the glass, possibly explosively.

The best advice about charging batteries is two simple things.

1. Don't charge batteries unattended.

This will give you the chance to notice that a battery is starting to puff and react by ripping the battery off your charger and throwing it outside via the nearest door or window before it starts to vent.

2. Charge batteries on a non-combustible surface.

If you don't react fast enough, at least all you'll do is fill your house with toxic gases and smoke which can be vented out after the fire is over.

My charger is positioned on a granite window sill. It is also right in front of me and I don't leave the room while I have batteries on charge.
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