A cheap no-name battery, or at least the expensive original ...? I am certainly not Markenfetischist, but after intensive research by a cheaper alternative to an original battery, I have - because of many bad experiences of users with various cheap batteries -. But then better chose the original Canon battery and can in this case only say: The NB-4L is worth the money, because there is nothing worse than a one-missed snapshot because the battery was empty again (!)! Conclusion: Many images, many movies and no problems for a few dollars more ... a thoroughly lohende investment for our IXUS 100 IS.