I have had Lithium batteries leak.  

Streamlight Seige's are nice little lights.   But if you are going to use them (or any AA light) for this then I would advice using Eneloop over Lithium batteries.   My logic is that if you have and recharge Eneloop batteries then at any given time you probably have a few charged up that you can scavenge from whatever device is using them.  That way you aren't leaving batteries in seldom used lights.   I had a weapon with light in storage and when I pulled it out a year later I found that the Energizer Lithium battery had swelled, leaked and ruined the light.    

We bought Eneloop batteries and a couple of Maha Powerex C801 chargers for the kid's toys when they were little.    Each time we would buy them we would label them with the month and year that we purchased them.   The kids are grown but we are still using the batteries and chargers.   The last time that I added it up we had over 300 Eneloop AA's around the house and we haven't bought disposable batteries in years.   The batteries from 2008 through 2010 don't work nearly as well as they used to but the rest are still holding up well.   I purchased more this year.  Even though I don't really need more I figured I can start phasing out the really old ones.   So even if we caught "unprepared" by a power outage we can find enough batteries around to power lights for a while.  

I also have can also use a cigarette lighter to recharge Eneloops.   So even if I run them all dead on the go I can charge them back up.  

The Streamlight Seige that I keep in my camper will run on red (as a night light) for three to four nights before needing a recharge on Eneloops.   And that is with it being temperature cycled being in the camper constantly.  

I hope that helps,

2Hut8

I have a Fenix FE12 also.  In my pocket all the time. Power with disposable lithium AA battery.

Deep cycle 12v battery, decent quality inverter, battery tender + a little scrap lumber = a portable 120v outlet that goes just about anywhere and is always ready to go in an emergency.

https://www.batteryjunction.com/streamlight-supersiege-opt.html

I have two of these; I highly recommend them .   They do take a while to charge though.

I got a 4 pack of these off amazon a while back. they are bright as hell and adjustable, plus you just pull them out to fire them up. Kid smashed one, and I found one outside the other day that had been on for at least 2 solid days. that was the one I used for my camp out last night.

I will second the solar landscape lights. I paid $4 each for a few good ones.

Also the ryobi light/charger. Don't have it yet, but I am deep into ryobi tools. Could charge and power stuff for days.

and finally a jump pack. You should have one in each car anyway. Some of them work great for powering even taht TV you posted.