Thanks!
I found this particularly interesting: " VERY important: A battery should never be charged below 10 degrees Celsius. All manufacturers agree on this."
I have an electric car. Some cars heat up the battery when charging in the winter time, some don’t. This means that many lithium batteries get charged regularly in sub zero © temperatures during the winter.
You inspired me as well, I’m going to add some Rockwool insulation around the inside perimeter and possibly the top as well. Can’t have too much fireproofing!
If you are looking for something portable to buy for battery storage this could be a good option if the dimensions work, although it’s ~$370 USD: 
Still cheaper than the $750 USD Zarges box that Lift resells for their batteries:
Extover, Pyro Bubbles competitor show their granule can protect the packing carton containing a burning battery 
A 30L metal bucket full of fire extinguishing granules for lithium batteries cost 50€/usd
https://www.voltmaster.de/ExtoverZ-Extover-fire-extinguishing-granules-for-lithium-akkumulators-metal-bucket-30l
Extover range of products : fire protection
I am currently experimenting with Zarge boxes in combination with Cirrux pillows:
Inside is a Radinn battery (which is really huge in its dimensions). This size works for all kind of batteries including Lift, Jetsurf and Lampuga (which is also huge). But since it is so big it is not good for smaller batteries like Lift. So I have to come up with multiple sizes.
Article should be ready soon. For urgent requests send me a pm through:
Cirrux looks interesting. Has anyone tested with bag(s) of sand? I had seen a video where a LiPo battery was covered in a plastic bag of sand. If it caught on fire, would melt the plastic bag and sand would smother the battery/fire - that’s what I’ve used in my battery bunker but I could consider Cirrux “cushions” depending on cost/availability.
I just use old BBQ grills. I figure if they can contain 700-1000 degree fires for hours on end, they should do alright for containing a 1-2kwh battery fire.
Thoughts on an appropriately sized ammunition can? Looks like a tall 81mm can should fit.
This video tests them by overcharging (smaller) LiPo batteries - best test is rubber seal removed so it can vent out:
Hi.
Both of my efoil batteries fit in this ammo can. At home I put the battery in a BBQ grill to charge it unattended. When traveling, I charge the battery in the ammo can with the lid off and keep an eye on them.
These large efoil batteries demand respect. They will easily burn down your house, or car, or boat. Scary.
Be safe guys.
For god sake the shipping cost!
I found one locally. Hit the guy up and see if you can get him to adjust the shipping cost. It is a big item, so I bet shipping isn’t cheap! The eBay listing is a good reference of the correct one anyways!
Nice one. You charge in a plastic/composite environment. Is it possible to control/orientate the direction of the puff flame in case of trouble ?
Hi.
I have a strap attached to the case and a wash down hose. I think I could hose it down and throw it overboard. Maybe. The idea is to catch it early and deal with it before it goes super nova! Might be smarter to charge on the swim step, then I could just kick it overboard!
Cheaper alternative:
https://www.ebay.com/itm/MILITARY-81MM-AMMO-CAN-VERY-GOOD-CONDITION-FREE-SHIPPING/321991391959?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Interesting to see these eFoil specific bags (they sell both Lift and Waydoo sized versions) - well priced at $220 USD relative to what else is on the market. Would be interested to see review/testing: https://solutionsdept.com/shop/waydooboardlithiumbatterycase-p-8.html
I have yet to see a fire bag that actually works. Seems like expensive fire safety theater to me.
Wonder how well a DIY concrete box would work? Cheap material, not that difficult to do a mold. If using a net to reinforce, will not crack that easily. Heavy to move, but on the other hand, also heating up during a fire will take a while. Concrete + rock wool, that would be rater safe ?
You can get proper fireproof cement and just use that…
