I normally buy Duracell or Energizer batteries because they work well and they last. The one time I tried some dollar store (size D) batteries and, brand new, they didn’t even have enough power in them to properly run my child’s (Elefun) game! This is the first time I have purchased an off-brand since. These Amazon batteries seem to work well. Even if they don’t last as long as my usual battery brands, since they are significantly cheaper, I should still be saving money in the long run. If I have problems with the batteries long-term, I will update this review accordingly.