This is the Modern Gaming section, so it's only natural that the topic wouldn't cover Mario games from the 80s and 90s.

My Game Boy Advance SP is from 2005, and it still charges just fine and holds its charge for what feels like indefinitely (as in, I can leave it untouched for several months and it still has its charge). Rechargeable batteries have been an industry norm for a long time, and they generally last longer than 10 years and aren't hard to replace when necessary. It is possible to replace a Switch battery, but obviously very few people need to at this point. It doesn't seem quite as easy as popping a new battery in an SP or PSP but still perfectly doable, and I'm sure there will be even more tutorials and more third-party options by the time Switch battery replacement becomes more common. While the batteries may not last forever, it's not really any different than older systems having capacitors, laser units, lubricants, etc. that give out and need replacement. No hardware lasts forever, and having to possibly replace a rechargeable battery eventually is worth not having a controller tethered to a system, a handheld tethered to an outlet, or having to buy separate AA batteries, either standard or rechargeable, add extra weight to the system/controller, and repeatedly replace those when they die. For that matter, I've had AC adapters for older systems die on me too.