Sony Sidecar Compatibility
This list may not be complete.
EBP-MZR2
Battery: LIP-12
Models: MZ-R2
EBP-MZ3
Battery: LIP-12
Models: MZ-R3
EBP-MZR4
Battery: 2x AA
EBP-MZR55
Battery: 2x AA
Models: MZ-R55
EBP-MZE44
Battery: 1x AA
Models: MZ-E44/E45, MZ-E75, MZ-E80
EBP-N10
Battery: 1x AA
Models: MZ-N10
EBP-RH10
Battery: 1x AA
Models: MZ-RH10
Model Number Unknown
Most late era devices shipped with this battery case. Most devices come with a basic sidecar. Some ship with a sidecar that has a DC Charge port. There seem to be at least two versions of it, one rated for 1.5v in (MZ-E900), and the other for 3v in(MZ-N10). Using a charger with this sidecar may cause issues with some devices they didn't ship with. Manual specifies multiple times they are only intended for use with their matching device.
Battery: 1x AA
Models (Sony): MZ-E30, MZ-E50, MZ-E70, MZ-E77, MZ-E500, MZ-E720, MZ-E730 MZ-EH50, MZ-EH70, MZ-EH930 MZ-R90, MZ-R91, MZ-R900, MZ-R909, MZ-R910 MZ-N710, MZ-NE810, MZ-N910, MZ-N920, MZ-N1 MZ-NF810, MZ-NH900, and several others - practically all MDLP and Hi-MD players.
Models (AIWA): AM-NX1
The sidecar itself also houses a 1000uF capacitor in-line with the terminals, which is speculated to help reduce battery-related spontaneous shutdowns while jostling the device, such as while exercising or dancing.
Content Adapted From: NeoG_'s Reddit Post