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Aero ‘lectrics
How do you condition a battery not in regular use to extend its lifetime? Run it down and then charge it back up. Jim Weir explains how to achieve this with about $10 worth of parts.
Small-bottle O2: Aithre, Aerox Compacts
Personal-sized oxygen bottles save space and weight, while serving as belt-and-suspender backup. But go bigger if you use O2 regularly.