A battery can die or have an issue at anytime, regardless of the quality. You just have a better shot at a long life with a high quality one...same with just about anything I guess. As for price, you need to get the part number and then do some research online. Based on where you are, how much a name brand one costs from the OEM, where you shop, etc...the prices can vary in range quite a bit.
Just remember to use the new battery instead of leaving the laptop plugged in all the time. That shortens battery life as well.
I think that's debatable. I've always run my laptops docked and always had long battery lives. I think using the battery for a short time and recharging will shorten the life.
I would recommend using the battery from time to time, and draining it down before recharging. That should keep it conditioned.
Quote