...they are not even included with the product.
We bought a pair of solar-powered LED yard lights for $5 at Menards. I stuck them in the ground on the way from our cabin to the outhouse. We never seemed to be here even at dusk since then.
Yesterday we finally stayed overnight to see the Perseid meteor shower. The yard lights didn't come on in the dark.
This morning I picked one up looking for some switch I should set. I saw none. I twisted off the top and found a battery with a plastic strip between its positive terminal and the flat contact of the lamp. I pulled the strip and the light came on! My other hand was over the solar panel! I took my hand away and the light went out.
Why didn't I think of checking that before?