First remove all the allen bolts or screws. Then loosen the cover sealant, the cover is glued down with some silcone. Tap a knife edge or simiar thin wedge to pop the seal on both sides of the motor.
There are some motors with screw on covers. 9c is not screw on.
Then put a large puller on the spoke flange, You can start on either side, depending on what side you want removed. Puller goes on the side you want removed. This is going to push the cover off the rotor on the other side, and push the stator and cover out. I push it out about halfway if I don't want to remove the stator.
This pic shows the stator, the motor core and the cover pushed out halfway. Now when you take the puller off, the stator will return to the motor, and the opposite cover will lift. If you want the stator out of the motor, just keep pushing.
Now you can reposition the puller, and this time put the jaws on the edge of the cover. Now the puller is going to pull the cover off the axle.
Viola, now you have one cover off.
Many variations on how to use the puller. You can partially push on the spoke flange on both sides opening the crack, then pull off both covers leaving the stator in the rotor. Or you can just push the stator out one side and leave one cover on the rotor, without ever taking the bolts off that side. The puller would go on the still bolted side, jaws on the spoke flange, then push the cover and stator out the other side.
It just depends on if you want the stator out or not. If you remove the stator, be dang carefull putting it back. You can literally snip off a fingertip. Don't grab anything but ends of the axle, and wheel rim.
THE LIPO RULES. NEVER ABOVE 4.3V NEVER BELOW 2.7V DON'T PUNCTURE
Ideal charging /discharging range for Lipo, 3.65v minimum 4.1v maximum
See battery technology section, FAQ thread at the top of the page for lipo noob info.