Replacement battery fits 8 FREETEL compatible models. Specifications: 2700mAh, 3.8V, Li-ion. Compatible with: Samurai Rei, FTJ161B, FTJ161B-REI, FTJ161B-REI-BL, FTJ161B-REI-SL, FTJ161B-REI-PG and 2 more compatible models. Replaces: FREETEL BP-RE1. FREETEL replacement battery designed for Mobile/SmartPhone devices. Manufactured to exact OEM specifications.