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This is kind of a continuation of an already existing question. I'm wondering if its possible to use a TP4056 based charger like this one to charge a 3.7 volt lithium ion battery with a 4.5 volt 45 ma solar panel. According to some specs and a post. it appears it's possible to get the charging current down to 50ma if you replace the resistor with a different value. Does this mean that its possible to get it down even lower like 40 ma if the value were tweaked to something like 40k. in particular I'm looking for a low cost already existing board to do the job.

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Well I'm not sure the technical implications, but it seems to be working very well, just takes a while to charge

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