Amazon.com: EXLIPORC Original 3.7V 481221 90mAh li-Polymer Replacement Battery for Powerbeats 2 3 Wireless in-Ear Headphones : Electronics
Amazon.com: Synergy Digital Wireless Headset Battery, Compatible with Beats By Dr Dre Power Beats 2 Wireless Headset, (Li-Pol, 3.7V, 90 mAh) Ultra Hi-Capacity Battery : Electronics
How to EASY Rreplace PowerBeats [Battery replacement] DIY - YouTube