Depends upon how long you leave it off. Lead-acid has self-discharge and if you leave it off for 3-months, it’ll be completely dead even without any USB accessories powered. It has zero excess capapcity for that time-frame. Li-ion can go for a year with bike off.
Due to cost differences, it may be more cost effective to buy a new lead-acid battery once a year than going with li-ion. Maybe if you’re racing, that 9-lb weight savings may be worth it.
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