[Al Skierkiewicz]

Richard,
You didn't specify whether your battery was a 12 volt or 24 volt source. If the battery is only 12 volts, the 885 doesn't do anything different as opposed to the 884. It merely uses FETs in the output that are a higher breakdown specification and that can handle 24 volts without damage. The current is what affects the motor speed. So as the motors turn and contact one or two windings as you have pointed out for the CIM motors, the current then steps four times as opposed to two. Since the current remains the same in a series circuit, the current through both motors is then affected. While one motor is contacting one winding, the other motor receives current dependent on how many windings are in contact with the brush assy. Minimum current would occur when each motor is only contacting one winding each. Max current would occur when both motors are contacting both windings each. However, if the source voltage is still 12 volts, the motors in series would only be able to reach half the maximum current. The motor specifications are taken with a power supply at 12 volts. So stall current for CIM motor of 133 amps would be halved to 66 amps which would flow through both motors. This may actually be advantageous in your application.
To remind everyone, not all DC motors are designed or operate alike nor are they electrically equivalent. They can have more or less than two windings in parallel.