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Aragorn,
I have an old motorbike 12 volter that has been with me for years.
With the advent of dew heaters I have supplimented it with a couple of sealed lead acids connected together. It lasts a good while, but to be fair I am not running a laptop as well. I think your concept is sound, and if all else fails try a "normal" car battery.
Post a piccie of the new setup, once you decide, and get it running.
Regards,
Gary
P.S, we lost the Netball, heck it hurts.
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