Welcome! You will find lots of varying opinions on here, that is what makes this place so useful. I have not had my aids nearly as long as some folks on here, I am a relative newcomer, but here are my two cents from a moderately active wearer (I sweat, especially when riding my bike or gardening, but I don’t produce much earwax.)
Many people swear by a drying unit, some with UV disinfectant lights. Others say only a dehumidifier is necessary. I bought a Stay-Dri dehumidifier container (after seeing a lot of positive recommendations for it) and put my aid in it every night, with the battery compartment open and the tube taken off of the body so that any possible moisture can be removed from the tube easily. It also keeps it safe from the cat, haha! I have not had to recharge the silica disk yet, but when it changes color a pop in the microwave will dry it right out. I do not live in a humid area, and I always take my aid out when there is a possibility of getting wet (like washing the car today.) If I lived in a humid place or got caught walking in the rain a lot I would probably get a drying unit.
You will also want a cleaning brush, usually I believe they come with the HAs (mine did). If not, they are very inexpensive. One end has a long straight stiff-but-flexible rod-like bristle, that end is pushed through the tube to clear it of any wax, dust, etc. The other end is just a little brush to clean off the body, the mic holes, and clear any earwax off of the domes/moulds. Mine also has a magnet built into the handle end for those who have trouble with keeping ahold of the batteries, I never use it and since you are asking about rechargeables it will probably be moot for you as well. But every morning I take my HA out of the Stay-Dri and give it a thorough cleaning with the brush, any wax that was there is dry now and easy to just brush off. If you produce a lot of wax or have problems with moisture the little vacuum might be useful, I think.
I don’t use ‘hearing aid wipes’ because I clean my ears daily and have sensitive skin so I am not usually one to use products like that. Some people find them useful, though. Maybe if you are prone to ear infections it would help cut down on them as well?
I thought about getting the little sweat bands, there are a couple of brands I have seen with good reviews, so they may be beneficial. But the model of HA that I chose did not have any holes on the side that are more likely to get moisture in them (they were labeled from the manufacturer as ‘sweat resistant’) and my glasses arm keeps it from sitting right next to my sweaty head anyway, so I didn’t. I still may pick some up, I like the idea of the one with the little loop to keep it attached to your glasses arm so if my kiddo and I are playing sports outside it would be dry and secure. I haven’t had it fall off yet but I am paranoid.
Sorry to ramble, I am nothing if not thorough and long winded, lol!