Another vote in the positive here for Super Cheaps jump starter battery packs. I have two a 17AH and a 24AH. The 24AH has a warning indicator once you get low on power which I have found to be very handy, it kicks in at 11V from memory and has only come on once. The 17AH powers my LX90 all night without any dramas and I use the 24AH for my laptop because it is a V8 when it comes to battery power.
You should be able to pick up a 24AH for around the $130 mark (17AH was under $100 6 months ago), I was lucky with the 24AH it was 20% off when I bought it.
Good luck with your choice, as you can see there are plenty of options.
Clear skies.
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