Is it worth buying 66i because of battery type?

Hello all,

I do consider buying Garmin 66i or 66st. The main benefit of 66i is a rechargeable battery, especially if I'm carrying solar powerbank during the hikes. On the other hand, most likely, I will not be an avid user of inReach features (paying for something not being used), hence, the 66st makes more sense. Which one would you select in my position? In the long run there is another issue for consideration, specifically, lithium batteries, like any other battery, have a lifespan, so it will be less and less useful over time. There is no information on replacing the battery.