Amazon.com: Battery Replacement for Philips GoGear Muse, SA2MUS16S/02, SA3MUS08S/37 Part NO BA504457SP : Health & Household
Synergy Digital Player Battery, Compatible with Philips GoGear Muse Player, (Li-Pol, 3.7V, 1400mAh) Ultra High Capacity, Replacement for Philips Battery - Walmart.com