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After 4 years of mowing my 1200 began stalling under load. I purchased 2 new batteries & I still stall if I push the mower a little. Not as bad as with old batteries but worse than when mower was new. If I wait 20 to 30 seconds , it starts up & works ok for a while until I push a little & then it stalls. Any suggestions ?
Joe

Clean the motor with compressed air. You may have to remove the motor to do it. But I think its just dirty in there.

I would check and make sure the blades are sharp, dull blades can definitely cause a mower to stall.