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Btw: What are you using to turn on/off this actuator? Maybe that can already be switched fast enough to work as PWM?
The device will see zero volts, as you're shorting its input :-)You want to move the "-" lead to the "-" that's on the bottom-left of the leftmost battery.Also note that the current draw on that battery will be higher than the draw on the top battery. Thus, it may discharge quicker.
Another spec listed is duty cycle.It is listed at 25%.If the motor is ran for 15 seconds, it will require 45 seconds to cool down.