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But, if you are meticulous, you are better prepared in a emergency with battery powered tools because you can work without power. What tools are required in a emergency I don't know, the best I could think of is fortifying a house before a hurricane with a battery saw (say a fuel milwakee) and drill (like if you needed to use a hammer drill to board up windows on masonry in a hurry)
The only tool emergency I ever had was a mechanism in a lock broke, at night, and i could not close the front door, during a power outage, and I got paranoid, so I brazed it longer together with a oxy torch, reassembled and went to sleep. (the bit that the rotation of the lock rotates to engage the latch).
By broke I mean literarly it was a new lock and the thing was cut wrong so I assume the thermal contraction of the door made it so the damn thing cannot engage with the lock! On a abloy I installed wrong. It was faster then looking for a new one or fabricating the part and it was cold, raining, late and I was pissed off. Otherwise I would have probably had to look for wood to brace the door with. Or spent 2 hours filing something with a head lamp. And I lost the spring clip, so I had to wire tie the thing down lol
I was glad to do it because that night just felt real creepy. It must have been engaging by like 0.001 inches or less! I never saw a door work with that kind of accidental interference fit before! (I must have cut it by eye with a dremel or hack saw or something. I don't renember how did it, but I thought I did a better job LOL.) Now I learned to use calipers when doing anything with locks.
The door did not work once (around fall-winter transition) and I thought nothing of it, because it started to work (very busy, I just thought the abloy was bad somehow and I would need to replace it).. then it totally failed and it was spinning. If there was power I would have put a heater against the door to see if it was actually thermals.. I think i brazed the head of a cut off nail on the tip of the thing to extend it. Of course the generator fucked up too! Thank god for good old gas.
Now one of those oxy/mapp gas micro torches is a great emergency tool if you can't afford a real set because you can do some weird stuff so long you get silver braze rod and some files to go with it (or just keep it around anyway since you are liable to run out of oxy/acetylene doing regular welding things). Use that with a few fire bricks because its very weak (they greatly will extend the power). If you keep a battery powered metal saw and some metal around you can jury rig some useful stuff.