The 650W DeWalt is not designed to knock down a brick wall. They are for light masonry drilling and chiseling not demolition. Get a Kango 900 if you need to demolish things or a Makita HR3000 for light demolition and heavier drilling. You would curse the Makita if you had to stand on step ladders drilling a few holes to put a curtain rail up and it is only 4kg. Forget about taking the Kango up a pair of steps to do anything with it.
Adam