Purchased this as a replacement battery for the Samsung X427. This was the only place I could find it since the phone is older. The new battery did not hold a charge for any longer than the original one I had for two years. I returned it to Amazon and they sent another free of charge. The second one is really no better than the first and also does not hold a charge for very long (more than a day). I will keep it to use as a spare in case the original one dies.