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The internal box is 9.5x6.5x4 inches. The external dimensions are 12x9x7 inches.
Three View
The flame arrester is placed in the box lid by design, as the act of opening and closing the box ensures a clear area around the exhaust holes to further help prevent the chance of a house fire.
Flame arrester principle
Prototype testing
With this box you can charge lithium batteries at home unattended in complete safety. To prove my point I set the BAT-SAFE in a cardboard box full of tissue paper to verify that even in this extremely flammable environment the box would perform as designed.
Box buried in paper tissue
And it worked. In the testing process, I have deliberately overcharged dozens of lipo batteries to the point of exploding. This included batteries of all shapes and sizes, from small to very large. As the design deprives the fire of oxygen, the temperatures inside the BAT-SAFE are reduced further helping to prevent a home fire.
Battery blowing up inside the BAT-SAFE
Comments
@Darius, so you get all your information from Google? Like those people who won't vaccinate their children? Come back when you have done lipo testing in a box with your own two hands, like the Kickstarter developer has.
@Damouav
you must be Primary School student.
My knowledge and experience is based on the knowledge and experience shared by
large corporations, universities at conferences, in printed or electronic form or shared directly via peer-2-peer contact.
For Ammu box standards contact DoD
For shipment of LiPo battery as air cargo contact your airlines
For LiPo charging safety guildelines, standards contact DoE, read ISO, DIN, EU
standards
Contact manufacturer of your LiPo battery, read instructions on charging, follow precautions.
Be aware that your LiPo drone battery is special nature battery not coming with built-in
balancer, charging controller, temperature sensor.
If you put your LiPo drone battery into closed metal, double wall insulated metal box for charging,
temperature can rise fast above 71C.
At this temperature a smart charger should stop charging to let LiPo battery to cool down.
Since your charger is not smart , not featuring temperature control sensor,
you can easily overheat your LiPo drone battery making it to set a fire and make the box to explode, if not "explosion proof".
To get "explosion proof" certificate for your LiPo drone battery bunker box you need
to pay $Ts to one of DoD accredited agency for tests and certification procedure
since you cannot claim "fire proof" "explosion proof" features by yourself.
So if you don't use smart LiPo charger with temperature sensor,
you put your LiPo drone battery into thermos like double wall insulated steel box,
you increase your chance to have your LiPo drone battery to set fire on charging
due to overheating over 71 C - charging cut off highest temperature
But you are fully aware, you can heat your LiPo drone batteries well above 100 C, if put into closed thermos for charging.
Risk is yours.You get warned.
You are still free to build smart LiPo charging bunker, featuring temperature control sensor, forced fan cooling and smart controller to prevent overheating and resulted fire.
@Damouav, don't bother.
@Damouav,
I am really sorry, but @Chris is promoting something known as
ammo box
the problem is, who did tested this LiPo charging bunker box, resembling ammo box to meet "explosion proof", "fire proof"
standards set by DoD.
It's not relevant to post a new blog post to discuss product marketed in this blog post.
Major concern is if the marketed product
can set a fire to charged lipo battery acting as a thermos to prevent heat dissipation and increased temperature may desintegrate LiPo battery and set promt fire
Another concern is if this LiPo charging bunker box resembling ammo box is "explosion proof" "fire proof" to meet standards set by DoD.
My knowledge is based on knowledge of real experts in the field
so I don't say "No" to this project, all I say is to check and verify if basic, known safety standards are met.
All we know about LiPo battery is faster temperature build up can set up fire at greater probability due to physics of LiPo battery and due to "Thermal runaway" phenomena.
So pls don't blame me that 2+ 2 = 4 and not 5 or 6.
follow-up (since edit disabled)
"
Bruno 731 points - 7/24/2013
Its a beautiful bunker for charging your lipo batteries. Can protect for a major explosion, but don't previne that it explodes. Always have in mind the right parameters for charging yours lipo, respect their limits, and do it in a safe place, far away from fuel materials! Regards!
"
@Dave Smith
follow-up
the promoted product has been known under common name of
LiPo bunker
LiPo Battery Bunker
or
LiPo Battery Charging Bunker
http://www.hobbyking.com/hobbyking/store/__24647__Turnigy_Lipo_Bunk...
and
http://forum.flitetest.com/showthread.php?4558-0-50-Caliber-Ammo-Bo...
http://flitetest.com/articles/lipo-battery-bunker
one comment under HobbyKing is worth every cent, just read it.
@Dave Smith,
did you open the provided links and read about Lipo battery thermal runaway physics ?
You get clear explanation of lipo battery thermal runaway effect by third, independent parties.
So placing lipo battery into closed metal box with double walls, limiting heat dissipation,
for charging, you exactly increase the risk of lipo battery fire.
You are free to contact manufacturer of your lipo drone battery for advice on how to charge your lipo drone battery safe.
Lipo drone battery charger should come with temperature sensor to limit overcharging, overheating and prevent possible fire.
Since marketed metal box was built exactly as 2-wall thermos to prevent heat dissipation, so it is not smart to claim otherwise and to claim
charging lipo drone battery put into metal thermos box is smart.
Just read lipo charging basics ( web links provided)
and pls calm down.
@DG
fiberglass insulation is not generally used indoor in Europe.
If used, should be coated, painted.
1B+ Lipo batteries are charged everyday world-wide (smartphones, tablets, laptops,
other electronic devices ...) and they don't burn your house, so generally speaking,
a risk to burn your house on charging smartphone, tablet is not great,
is contained and is very limited.
Chris said:
"
I have deliberately overcharged dozens of lipo batteries to the point of exploding.
"
How can you let lipo batteries to get overcharged ?
Your charger is faulty.
Your charger is not fit to charge your lipo battery:
- charging voltage, current don't match lipo battery nominal voltage, current, capacity
- you still use old lipo battery charger not equipped with temperature sensor
to detect increase in temperature of your charged lipo batteries above the safe limit
You are correct, lipo battery chargers and lipo battery packs for personal drones,
don't come with temperature sensor to detect overcharging in advance.
@Chris COB at 3DR
and others.
I am really sorry to have to say, you should never put your lipo battery into closed box
for charging.
Why ?
read first
https://en.m.wikipedia.org/wiki/Lithium
"
Carriage and shipment of some kinds of lithium batteries may be prohibited aboard certain types of transportation (particularly aircraft) because of the ability of most types of lithium batteries to fully discharge very rapidly when short-circuited, leading to overheating and possible explosion in a process called thermal runaway. Most consumer lithium batteries have thermal overload protection built-in to prevent this type of incident, or their design inherently limits short-circuit currents. Internal shorts have been known to develop due to manufacturing defects or damage to batteries that can lead to spontaneous thermal runaway.[139][140]
"
read then
https://en.m.wikipedia.org/wiki/Thermal_runaway
"
Thermal runaway refers to a situation where an increase in temperature changes the conditions in a way that causes a further increase in temperature, often leading to a destructive result. It is a kind of uncontrolled positive feedback.
In other words, "thermal runaway" describes a process which is accelerated by increased temperature, in turn releasing energy that further increases temperature. In chemistry (and chemical engineering), this risk is associated with strongly exothermic reactions that are accelerated by temperature rise.
"
Putting your lipo battery for charging into closed box, you exactly risk to invoke Lipo battery Thermal runaway more frequently than charging your lipo battery in open.
So in practice it's against any safety standards to put your lipo baterry into closed metal box for charging, since you keep temperature of lipo battery to rise much faster in closed cavity, since forced fan cooling or heatsink are not present, there is no electronic unit to control lipo battery temperature in the box either.
So you risk lipo battery thermal runaway to happen at much higher propability
than if charging your lipo in open.
So in theory, you have built Lipo battery thermal runaway Box which can easily explode
exactly due to thermal runaway, since lipo payload is not controlled to match box size.
@Chris
I am really sorry, I am not ready to test if lipo battery can explode if charged in closed metal box due to thermal runaway and at what temperature and how often
but the risk is known and cannot be contained.
If you are aware of any lipo battery fire risk, especially in case of lipo battery for your drone, always charge your lipo drone battery outdoor,
call your local firefighter to find the best and safest place not to risk any fire.
Phew, that was fun. Back to real life.
Remove the fiberglass insulation from the walls and ceiling. At least that way if your house burns down from a lipo battery fire the risk of inhaling burning fiberglass particles is greatly reduced, assuming you're still breathing.
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