I mentioned a few times like "when fully CHARGED" and that implies there is a rechargeable battery inside. I DID mention "no need to CHANGE the battery" - "CHANGE (=replace)", not "CHARGE". "Solely solar power" was used in the context of the source of the power.
And here: home.watchprosite.com , I wrote "the battery can be charged by the normal fluorescent lights and the charge time is so short..." that also implies there is a rechardeable battery inside.
I do not even dream of the watch lastin 9 months without rechargeable battery inside.
Am I clear enough now? To avoid the doubt, if you are asking whether there are TWO batteries inside, I don't have the answer.
Welcome to PuristS, by the way.
Ken