I can probably help with connecting a meter to see if the battery voltage drops really quickly as noted above. The other possibilities would be a build up of grass and or debris that is causing additional friction, and the motor is sensing the overload and shutting down. I would expect the blades and motor to be relatively easy to spin.
Send me a PM if you would like me to look at it, as i do not post contact info on open forums.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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