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{ 3 comments… read them below or add one }
They can be charged indoors but need to be placed in direct bright light (such as under the edge of a end table lamp) in order to charge at a decent rate. It will still take longer than in the bright sun though.
Edit: If it is the kind that just uses rechargeable AA batteries or similar then they can also be charged in a regular charger outside of the light.
probably only by sunlight. There are special “chemicals” and catalysts in the sunlight that artificial light cannot have. I’m not sure if that’s relevant, but I do believe that sunlight is the only option. (??)
Indoor light is OK. in my experience.