I've always used a 12v leisure battery. Used to have two 75ah ones for when I did nationals and they lasted perfectly for powering charges, dischargers, lathes and soldering irons.
Now I just have a sole 110ah one which does club and regional meetings fine and quite happily powers 2 chargers for a day, but have had four running off of it at odd occasions.
They are quiet, generators do my head in with the noise and smell. My last one 12v lasted four years and cost me £85 making it far cheaper than a reasonable generator.
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