Extend battery life with your CuddeLink cameras. Use with or without batteries in CuddeLink cameras to extend runtime for up to 9 months. Features 2 battery banks: primary & backup. Each bank holds 6 D batteries which are equivalent to 96 AA batteries for 1/4 the cost. Bank 1 can use NiMH solar charged batteries to run CuddeLink cameras indefinitely with Bank 2 serving as backup power (batteries & solar panel sold separately).