Yes, fit perfectly in my Dell Inspiron 1750 laptop. Purchased in June and it's still charging fine. Seems like these aftermarket batteries last about a year or so but at the price on Amazon compared to buying one from Dell it's a no brainer.
We ordered this replacement battery for my 4 year old Inspiron 1545 and installed it as soon as it arrived, since the old battery died just about that time. We followed the enclosed directions for installing it (charging it fully overnight with the computer turned off) and it has been working fine ever since.
In my experience, the slider piece that unlocks the original battery was the problem. The new battery which I ordered was slightly bigger than the factory model, and it didn't allow that slider piece to move completely back into place. I had to make sure the battery was as snug as it could possibly be and then manually move the slider piece back into the locked position; the new battery has charged beautifully since doing so.
Batter has a latch that must release the battery from the computer. It located just near the battery and is a slide switch function. Once the battery is released simply remove and the new one will slip in and lock by itself. Gpod Luck