Zen MX - can it be left on AC power continuously?

I'm potentially interested in the Zen MX to replace an old Nomad Jukebox 3 in our restaurant. But it would need to remain on AC power all the time - is this OK for the MX?
Many MP3 player manuals warn against doing this because of risk overheating the battery or charging circuits.
What we'd really like is a full-size stereo-equipment-stack sized player with large screen and big control panel - I have never seen one of these produced by anybody anywhere (it would be more theft-resistant too). Everything is pocketsized these days, but there are applications for rack-sized MP3 players that are part of a permanent installation.

Speaking as a current Electrical Engineering student, it is fine to leave a mp3 player on AC power all the time. Now a days lith-ion batteries (which is what most batteries are for these devices) have circuts in them to prevent them from overcharging or overheating. Depending on the device, some may not even use the battery when it is plugged into a wall socket. So yes, it would be safe to keep it on AC power all the time.
I have done this with my Zen Vision M, and it has not caused a problem.

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