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@ai6yr @BetoOnSecurity A surprising source I found for backup power was my electric outdoor power tools (mower, weedeater, leaf blower), which all use the same battery packs. I found a 300 W inverter compatible with their batteries, which could definitely charge up a laptop or phone several times with the capacity of the 4 batteries I have (total 720 Wh).
I keep those batteries constantly charged for yard work anyways, so they should all be fully charged unless an outage hits right after mowing.