Depends on the intent/use of camera, and more importantly, the ease of access to the camera/time involved to replace batteries. I currently use Eneloop rechargeable for "low activity/ease of access" where I can typically get 6-8 weeks of photos, Energizer Max for "mid activity/mild difficulty accessing the camera" where I can 8-12 weeks of photos, and Energizer Lithiums for all other applications (high activity/PITA to access). Outside of a solar panel, Lithiums are the gold standard, but they are costly. I buy in bulk at Sam's Club or smaller 6-8 packs at any Bucees location. Remember fuel cost and how much you value your free time when considering replacing batteries. Good luck!