Tenergy Combo: 3pcs 3.7V 160mAh 25C LIPO Battery for Micro Helicopter: e-Flite MSR X/ Parkzone/ Vapor, Cessna / Micro Citabria Used mainly with E-flite MSR X helicopter and with E-flite 4-SITE bi-plane Capacity: 160mAh (single piece) Discharge rate: 25C (single piece) Cell Dimensions: 44x12x6mm Direct replacement, No modification needed!