My WCO v2 has inexplicably reached 30% charge (solar panel only) today after bottoming out a few days ago… 
EDIT-1: Now, towards the end of the day, it’s up to 42%. Them wyze peeps need to noodle on this a little bit. Would have been preferable to have noodling prior to product release.
EDIT-2: Next day… actually reached 43% and is still showing the charge indicator during peak daylight. However, charge is now depleting…
EDIT-3: The cam continued to deplete even during several bright daylight days. I arrived on site to visit the parents and changed it while it was in the 20-something-% range. Never did it begin charging again.