The 3DS (especially if you can pick up a used one) is actually an excellent choice for access to almost all of Nintendo's handheld library after installing the custom firmware hack. DS and 3DS games are supported via cartridges and the rest can be found by installing the .cia files. I haven't tried NES and SNES games, but it runs GBA and GB games great.
colejohnson66|5 years ago
shorts_theory|5 years ago
bentcorner|5 years ago
I'm pretty sure you can replace the battery on (most? all?) 3DS models. At least on my New 3DS it's user serviceable.