Panasonic Minidisc Battery Issue

I have a Minidisc recorder, SJ MR-220 which I found after years, I used to have the Ac Charger but lost it, so bought a new battery yet hen I placed the battery in the unit it said, 'low battery' even though its a fully charged battery. Does this unit need the AC charger connected to it to allow it to work? If so, where can I find a suitable charger for my unit.
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