You want this. https://www.aliexpress.com/item/1005006728908037.html?spm=a2g0o.order_list.order_list_main.23.539d1802xMWGQ2 It took me a while to find one with PPS that can do 3 air 3s batteries at 100 watts. Most others don't handshake properly...
lol no, don't store them fully charged. They will discharge to 60% after 9 days. You're just going to waste cycles storing at 100 just charge the day you are going to use them from 60 to 100. takes bugger all time to do it.