USBC Rechargeable Battery Case For SONY Walkman MiniDisc Player Cassette
USBC Rechargeable Battery Case For SONY MD R90 R91 N1 N710 R900 R909 R910 N810
Compatible with most models of CDs and MDs
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This is a 3D printed battery case that can be charged via USBC and comes with a 14650 lithium battery
The lithium battery has circuit protection and a charging indicator.
After converting to 1.5V, the battery capacity is about 2800 mAh