I also picked up a 7Ah sealed lead-acid battery for my portable work, relegating the AA batteries to emergency power as the sealed lead-acid battery should provide enough power for a few hours of operation, though if I am close to it my scooter would also be able to provide power, it too has a 7Ah battery but I need to use care not to run it down as it's not for deep discharge and starting my scooter would not be possible otherwise.
So later on today I will be up at the same car park I tuned my T2LT and will be taking to the air, look forward to making some contacts tonight
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