Replacment of lip-8 and lip-12 batteries for €18 each plus shipping. No need to search anumore and these are future proof. PM if interested. : r/minidisc
Sony LIP-4WM replacement battery for Minidisc players - buy at digitec
Sony LIP-8 akku (meghosszabbítva: 3267736253) - Vatera.hu
PowerSmart 3.6V 2200mAh 7.9Wh MD Walkman Battery LIP-12, LIP-12H for SONY MZ-R35, MZ-R4ST MZ-B3, MZ-E3, MZ-R2 : Amazon.in: Electronics
sony md隨身聽mz-r50,mz r5st用電池LIP-8電芯替換服務- Taobao
Sony LIP-4WM replacement battery for Minidisc players - buy at digitec