I have an old 1/2" Ridged R841150 18V Drill that was still working well until I mistakenly used a new X4 Lithium Ion Battery on it. I pulled the trigger and it was working fine until under heavy load and then made a popping sound and so I let go and took the battery off. I put the original NiCad battery back on and it now only operates at an extremely slow speed. My NiCad batteries are still good and hold a full charge so I know it is the drill itself. I'm thinking the draw from the new X4 batteries destroyed the switch, but before I replace it are there any other possibilities for this issue? Thanks
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