I purchased this battery in February 2008 as a replacement for my original iBook battery. When first installed it gave almost four hours of use from one charge. Now, less than five months later, this battery only gives 30 minutes on a full charge!!! The original battery from Apple worked for over three years before needing replacement, now, I'm forced to replace this battery after five months! I find this unacceptable and I do not recommend this product.