Over the years I gave my father 3 casios, frogman GW200MS-1a, a GX56-4DR, and a GWM5610 . He stopped wearing them and placed them in their respective tins, and they have been sitting for 2 and 3 years. He needed to wear one the other day and all 3 were dead, so he asked me what to do with them. I took all three of them and placed them in a south facing window and left them for a week. Upon remembering they were there, and checking on them I found the following:
GW200MS-1: completely dead, and did not revive.
GX56-4DR: display shows, but I cannot set the watch as the adjust button does nothing. Battery indicator does not show battery level.
GWM5610: I was able to adjust the time and date, but the battery indicator does not work, and the mode button does nothing, nor does the EL button. Battery indicator does not show battery level.
What are the proper steps to get these 3 back up and running properly? I have never had issues with solars before as I keep all mine charged.