I've been using EGO branded tools for roughly six years now. The push mowers work fine, but each of three has stopped working for me after a year or three of moderate intensity usage. The same batteries are usable in the trimmer (really good, though my one is now having an issue after five years), chainsaw (also really good), and blower (downright outstanding).
I got a Ryobi riding mower last year, and it has been great. I believe it has older battery tech (not LIon), but it's certainly hanging in there with my own usage.
I even have a few Black & Decker electric tools still around as backups, though I did have to get replacement batteries for them about two years ago. I've had these tools for probably thirteen years or so (trimmer, blower, little chainsaw, drill) and all are still working fine. Only drawback to these has been the shorter runtimes of the batteries (obviously pre-LIon).