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If I use a 12V power adapter on a 14.4V (battery) drill or an 18V (battery) circular saw, will it decrease my drill/saw power? Should I get a power adapter for each (i.e. one at 14.4V and one at 18V)? Also, is it possible to have too much current? For instance, if my drill was only able to handle 5A, and I used an adapater with 10A, could it damage my drill/saw?