Ah, the mini-disc, loved it, and it developed quite nicely. My first one was a Sony [0]. It had 3 hours (they said 4 but meh) on one special li-ion battery (and 6 when I hooked up an external 2 AA compartment, they said 10 but no). When my wife got one, shortly before they got out of fashion hers could run for 40 hours on a single AA battery and fit 4x the amount of music on a disc.<p>[0] <a href="https://www.minidisc.org/part_Sony_MZ-R55.html" rel="nofollow">https://www.minidisc.org/part_Sony_MZ-R55.html</a>