Bosch rotak34r keeps stalling under light load

Hi
Our grass is perhaps 4 inchs long and isn't wet. However the law n mower appears to be struggling to cut it. I can hear the motor wanting to stall.

Any help fixing this issue will be appreciated
 
There are a few possibilities;
the blades could just be be blunt?
The motor brushes, as camerart says, the centrifugal brake could be sticking, the bearings could be failing etc.
 
Sharpen the blade like a razor or serrated knife. Then never leave the battery dead in future. That sounds like your history unless you offer more info.
 
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