How much do you know about batteries, and the fact that they all have a finite life span, rechargeable or not? Oh and one more question. How often do you feel the need to be a d*** to someone you don't know?
Believe it or not, I actually know quite a bit about batteries. Not only do they have a finite lifespan, but some variants develop "memories," based on rate of charge, etc. And no, that's not Google internet knowledge being regurgitated. And we could go on and on about NimH, Lithium Ion, etc., Not worth it.
I also know a bit about traditional Land Nav with maps. For instance if you've never actually tried to navigate using a topo map and compass, then you're 50 state road map isn't going to do you a damn bit of good. And even if you've done extensive work with topo maps, if you haven't brushed up on it in the field in 5, 10, 20 years, then you're screwed again. And I don't care if it was the Army or the Boy Scouts or whoever you learned from initially.
If you're not training on it, or at least trying to brush up again, you're going to be screwed when the big, bad SHTF EMP knocks out all the electricity and Sat feeds and FEMA goons are looking for you because you're really important to the resistance. Even topo maps look quite different than what you're going to be looking at on the ground.
99% or the SHTF bag prep stuff is total horseshit because the folks doing this kind of thing are mentally masturbating looking at their maps and compasses in their homes instead of going for a hike, camp-out, walk, run, learning how to shoot an azimuth, what their pace count is, dead reckoning, whatever.
And as to being a dick online? Dude it's the internet. It's a filtering system. Those who can handle it, learn. Those who can't don't. Everyone is a hero and an expert on the internet with Google these days.