Product Description:
Battery Capacity : 3.85V 55mAh 0.21Wh
Replacement Battery Model: Z52H(1240)

Case battery
 
Model:731834
Type:Rechargeable
Battery Size:7.3mm * 18mm *34mm
Voltage: 3.85V 450mAh 1.732Wh

 Compatable with :
 
Sony LinkBuds S/WFLS900N/C

Package include:
2 x Z52H 3.85V battery 
1x charging case battery
 1 sets tools