Best AIWA LIB-902 or JVC BN-R3610 Lithium battery modern replacement adapter

Summary I have design yet another version of an adapter to use modern batteries in place of AIWA LIB-902 or JVC BN-R3610 3.7 V Lithium battery for vintage MD walkmans as JVC XM-R70 No commercial use allowed, no selling printed model allowed and no derivative of any kind allowed
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Aiwa GS110 Walkman

Repairing AIWA GS110 Walkman

I got this Aiwa GS110 cassette player ( or walkman ) for free from a lady on Facebook Market place.It appeared very sick. Symptoms: buzzing noise over the very quite music, low motor speed.I decided to take it apart to see what is going on. Specs Impossible to come by 🙁 Please
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