The TROLL^® Battery Pack supplements internal battery power when a Level TROLL^® or Aqua TROLL^® Instrument is used for frequent fast sampling or during long-term deployments. The battery pack is also compatible with the BaroTROLL^® Instrument.

When this power source is connected, the device will use the external battery source first and switch to the internal battery when external battery power is depleted. Communications are passed through the battery pack.

The estimated battery lifetimes of the Level TROLL and Aqua TROLL Instruments are 11 months and 2 years, respectively, logging all available parameters at 2-minute intervals.