i have two of the red hardcase 4000mah 2s batts and two rhino 5000mah 3s but one of em decided it was gonna not balance. i alos have two of the turnugy accel-6 chargers and all the products have ben more then good....their great! I am gonna order two of those black turnugy 2s 5000mah batts and two of the turnigy 5000mah 3s.