The last couple of months I’ve been studying batteries and found out that they are not safe. So from now on I’m powering my Coldcard with this, when I have to buy coffee.
#safetyfirst 
Discussion
T’was fun to have one of those, especially when we used the fuel bricks to set off old cartridges that we filled with gunpowder… Metal fragments flying all over the place!!
Super cool
Haha I also got one of these. I remember back at Miami 2022 I had steak with a very interesting guy who had a real one and was using it for mining 🔥🔥