You mean aftermarket batteries? Mugen and Seidio get okay reviews sometimes. Sometimes people say that the extended life but same size batteries don't perform much better, if any, than the originals. If, however, you go for a battery that is physically larger and has a higher capacity than the original, you have a much better chance of getting good results. However, as a general rule from what I have read so far, the batteries that come with your devices are more likely to actually keep the promises about battery performance.
— modified on Nov 25, 2010 10:54:41 AM