@ai6yr you can measure your own results periodically and base things off that, but I don't think there's going to be one good safe solid answer besides "Don't push more voltage than the batteries can take, and use a charge controller that safely stops when they hit their capacity". The batteries are going to offer varying levels of resistance between production runs, brands, lifetime, and temperature conditions.
(I should note that I'm new to this, but those are my findings from measuring times and watt-hours needed to charge my 18650s up)
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AI6YR Ben
In response to this post@DarcMoughty Thanks. This is normally maintained very well by a very good solar charge controller, it's just been poor solar conditions (winter + smoke)...
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