Battery for Speaker JBL Flip 2 Flip II, Li-Polymer 2200mAh 3.7V
JBL Flip 2 Battery - iFixit
Synergy Digital Speaker Battery, Works with JBL Flip 2 (2014) Speaker, (Li-Pol, 3.7V, 2200 mAh) Ultra High Capacity, Compatible with JBL JN151PH13849 Battery - Walmart.com