The RUST Small Rechargeable Battery is a deployable electricity storage device used as a backup for power systems in the event of failure.
Small rechargeable batteries are the lowest volume (150 rWm) battery type, capable of outputting very little power (10) at a time. They are virtually unusable for things like Auto Turrets, SAM Sites, and other assorted serious electrical systems. You simply need to employ a larger battery, such as the Large Rechargeable Battery. The primary utility of this battery type would be an Electric Heater and maybe a Ceiling Light for your winter farm base. They are widely recycled in the early portion of RUST wipes due to their resource output.
Small rechargeable batteries are found in an assortment of low-to-mid-tier crates, as well as dropped from many scientist types. Players may learn them directly or through a Scrap investment into the Tier 1 Workbench tech tree.