The battery life in those Solar Signs is ridiculously LOW ! ! !
The “several” hours of sunshine recommended by Ring should instead say “12 Hours or more”.
You can increase the useful life of the battery by charging it up to 100% of its capacity BEFORE you use the sign at all.
But, once the battery is dead - it is too late to do that.
ONLY choice is to replace the battery & start over.
But those batteries are NOT cheap.
Constantly having to replace the battery makes the cost of operating the Solar Sign UNREASONABLE.
I now wish I had never bought the 1 I have.
I quit buying batteries for mine & now use it as an UNlit sign.
A VERY EXPENSIVE unlit sign ! ! !