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Thank you very much. That seems fine to me. I won't need charged batteries every day.
Thank you for your fast reply. I am planning to try charging AA batteries. I don't need them to charge fast. But what do you mean by very long? Are you speaking in terms of days, or even longer?
Ordered parts. Can't wait to make one. How can I know if a battery is fully charged? Would it be easy to add a status LED or something like that?