Graphtec B-569 Rechargeable Lithium-ion battery pack (7.2 V, 2900mAh)

The battery pack option (B-569) allows operation independent of ac power.

A fully charged battery allows an operating time of 5-7 hours depending upon data logging configuration.

Further, the battery can operate as a UPS (uninterruptable power supply.) In the event that ac power is lost, the logger will seamlessly continue operation on battery power without interrupting the data logging process.