My situation and decision making had different factors. I’m stationed overseas and travel frequently, the thought of having to hunt down a local source for batteries didn’t sound like much fun. Having rechargable units removed that problem. They can last all day for me. Heck, my cellphone barely lasts a day and needs to be recharged so not much different. USB ports are everywhere now. In cars, at bars, etc. I know if I’m worried I can bring along the charger case and a battery pack and charge the aids about 10 times off a single battery pack charge. And throwing them on the charger while I’m in the shower or doing something else where I dont need them for 30 minutes boosts the charge by a few hours. Plenty to cover my needs.
Seems like rechargable are the future. If you follow the Dr Cliff videos, he says now 90% of all units he sells are rechargable… Hopefully the manufacturers will figure out how to increase battery and features!