I had a Black and Decker electric lawnmower. No cords. Just a battery and this is it. The original battery was like $100 or something. This was much cheaper and only 10% weaker. No biggie on small lawns. Is a problem on larger ones and a much bigger problem on wet large lawns, which is why I dumped it and got a Sears mower that increased my carbon footprint, but is a breeze on large lawns. If you're in California, where it's increasingly hard to mow your lawn with anti-pollution laws and you have a Black and Decker lawnmower, then this likely will fit. Just look at the description. They are easy to pull apart, vacuum the leaves out and assemble in reverse. Likely will last two years, maybe three before you will need to replace. But so worth it. Otherwise can pay $$$ to have Black and Decker to do it for you. Not necessary.