Batteries are based in the solar panel and can be changed easily.
the panel is 11 cm high and 9 cm wide.
Yes, these come with 900mAh. It matching the output needed along with the panel size.
20 copper ball lanterns (4cm diameter)
All our garden lights are designed to be outdoors.
Copper is just the effect, Copper in colour so no problem with turning green.
The lanterns are equally spaced 50cm apart. The solar panel with it's integrated battery are at the end of the string, 2m along the string from the first lantern.