Batteries go with trail cameras like snow with a Montana winter. In this post, I look at options for internal trail camera batteries. This post is in two sections. In the first, I consider “per charge” capacity of 4 types of AA batteries, two primary and two rechargeable. I include a relatively new rechargeable option based on Lithium-ion technology. A handy graph shows how “long” a set of 8 of each of the battery types will last in a typical trail camera on a single charge in the field. On a related topic, I also consider SD card usage and sizing based on battery capacity. In the second section, I consider the tradeoff between primary and rechargeable batteries, including factors peculiar to camera trapping. I provide a simple selection guide for primary vs. rechargeable batteries based on temperature, service rates, and activity at the set.