Ammo can storage

I use a 81mm mortar ammo can, was like $30 to my door from Amazon. Will easily hold 3 full size batteries with room to spare. I lined it with fire insulating blanket. It should contain a mishap if a battery goes south on me, or at least minimize the damage. I keep batteries and charge inside the house.
 

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I've been eyeing a fire resistant cabinet like the one you show above. I'm going to have to re arrange my garage
I forgot to add details. I actually looked for a cabinet for nearly 3 months. Zoro had a sale AND free shipping. I was shocked by the deal and jumped on it. Listed now for $508.87 plus shipping. I paid $270 shipped. Which was $100 less than what i saw used being sold for. Seemed to good to be true but sure enough free shipping too. I have seen them for $400 shipped, using Google search tools i got at leadt one listing a day until zoro popped up
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I used a surplus 50 cal can and bolted it to a rear rack with rubber washers to cut vibration. Lined the inside with foam to stop stuff from rattling around.
 
The R/C guys use ammo cans to charge and store their hI-discharge batteries for helicopters. You’ll need to remove the seal so it will vent in case of a fire. They also use cement blocks and stepping stones to form a bunker. They are real cheap at Home Depot.
 
Newb ebike dude here. I have a couple of 13ah lithium batteries to maintain on my new bike. My garage is very hot in the summer and very cold in the winter. Not the best place to charge or stow batteries. Which leaves me to my radio room where all my electronics and radio (ham) stuff is. I have a large ammo can, and is it safe to store and or charge a battery in this? I don't really have another choice. Is storring a battery inside your home safe.
Another possibility; I am using an old cast iron woodstove (much larger inside than my ammo can) vented through a non used chimney to store batteries, and I charge outside or on a stone floored foyer with no living space above.
 
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