Re: need new battery for dell inspiron 1520
I've bought a half dozen or so Dell batteries off of Ebay and had good luck over the last few years. Other people on TF, though, have not and it seems to be a mixed bag. If you look there make sure you buy from an extremely reputable seller and genuine Dell batteries if at all possible. The chinese knocks offs probably aren't so great.
Barring that I haven't shopped for laptop batteries anywhere else in a while but I'm sure someone else can recommend a good non-ebay source.