This is the E-Flite 150mAh 1-Cell 3.7V 25C Li-Po Battery. It is used in many airplanes and helicopters, such as the E-Flite UMX Ultra-Micro series airplanes, Parkzone and Hobbyzone airplanes, and the Blade Nano QX Quad, mCX, and mSR Helicopters.
Weight: 0.14 oz (4.15 g)
Length: 1.47 in (37.5mm)
Width: 0.48 in (12.2mm)
Height: 0.22 in (5.5mm)
Maximum Continuous Discharge : 25C
Maximum Continuous Current : 3.75A