Hi Lee,
I'm also back after 30 years, and there's still no better field power source than a decent 12V battery or a generator. Obviously the battery is much cheaper and quieter too.
Even though I have a leisure battery I still use an old car battery from time to time when the leisure one is spoken for, and easily lasts a full day running a dual charger.
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Back from 30 year retirement finding use for my thumbs again, slowly getting faster!
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