Like many others, I recently had the problem that the original battery of my Dell Studio began to weaken in 1555 and I was annoyed every time you start with prompts for battery replacement. A quick research on the manufacturing side then promoted an absolutely insane price revealed: 120,00 for a new battery.
Fortunately, there are these inexpensive replacement battery that fits perfectly into the laptop and performs well (me almost better than the fresh battery Dell). Otherwise, I would probably have to switch to cable operation!