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Walkman Minidisc Player External Battery Pack Case For Sony Md Cassette N1 R900 - Accessories - AliExpress
Sony MD MiniDisc Player External Battery Case (EBP-MZE44) 880537481677 | eBay
EBP-MZ3 External Case AA Battery for Minidisc Walkman for LIP-12 | eBay
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Aiwa AM-F65 Minidisc Recorder battery replacement
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Li-Ion-battery - 2600mAh (3.7V) - for portable mini disc, mini DV Denon DENON DMP-R70 - Electropapa
Repairing a LIP-12 battery (MZ-R30 and such) - Minidisc - Sony Insider Forums