The Graphtec B-569 Battery Pack (installs within the mainframe, powers the system for approximately 6 hours) for Graphtec GL240 and GL840.
Important note: The B-569 batteries will be backwards compatible with the GLx20 series and will carry additional 30% capacity (2900mAh compared to 2200mAh on the B-517).
Features:
Rechargeable Lithium-ion battery
7.2 V/2900 mAh
Compatible with the GL240, GL820, and GL840 dataloggers