For Beats Powerbeats 2 Wireless PB3 bluetooth Earphone
3.7V 90MAH/0.33WH
For Beats Studio2.0 Wired Headphone Wireless Headset
3.7V 560mAh/2.072Wh
For Beats by Dre Solo 2 and Solo 3 Wireless
3.7V 350MAH/1.29Wh