Hi...I bought a syma s018 rc mini helicopter a week ago and it was working great but now, when i fully charge it, it doesn't have enough power to lift off the ground. Is my battery defective? It seems to run well, it just won't rev up enough to fly.

If your Brookstone Stunt Copter RC helicopter is not getting enough power after being charged, there could be a few different issues that could be causing this. Here are a few things you can try:
Make sure the battery is fully charged: It's possible that the battery was not charged for a long enough period of time, so make sure the battery is fully charged before trying to fly the helicopter again.
Check the battery connections: Make sure the battery is properly connected to the helicopter and that the connections are clean and free of corrosion.
Try a different battery: If the issue persists, try using a different battery to see if that resolves the problem.
Check the transmitter: Make sure the transmitter is properly charged and functioning.
Check the helicopter's Motor: Check the helicopter's motor to ensure it is working properly. If the motor is not working, the helicopter will not have enough power to fly.
Check the helicopter's circuit: Check the helicopter's circuit, if any of the circuits is damaged, it may cause the helicopter to lose power.
If none of these steps resolve the issue, it is possible that the helicopter may be defective and require repair or replacement. In that case, contact Brookstone customer support for further assistance.

If the gears are meshing properly and the rotors are not spinning very fast then the motor shaft is slipping in the hub of the first gear.

i beleave that it is still charging if the light is red. Not 100% but it should turn green when done. also i read somewhere the real charge time is 50-60 minutes

Hi,
Push the button on the top side of the remote control and the blinker will stop!

Very important with these motors and the batteries is a solid 5-10 minute rest after charging and after flying. Make sure the shaft is fully seated. Push it down firmly (but gently) both above and below bottom rotor.

Let me know if this doesn't help.
PvT

Test the batteries somewhere else, the batteries might be bad.
Then test a different set of batteries in the RC.

try this,switch the helicopter on,then make sure the left controller stick is fully down then turn the controller on,move left stick fully on then fully off should be ready to fly,have fun

Mine's exactly the same as yours. Although the transmitter shows A B C the switch has only two positions, so there's a choice of two only. I doubt it's possible to fly 3 at the same time.

the tail rotor keeps it from spinning thats its job

Turn the remote over and look for the sliding door on the back bottom right (it has a circle and some arrows on it, push in the direction of the arrows) the cable is under this door. Then connect that cable to the helicopter by plugging it into the white slot next to the on/off switch.