Campbell Scientific CR3000 Micrologger - Manual (Page 422)

Section 9. Maintenance
422
o Time. Clock will need resetting when the battery is replaced.
o Final-storage data tables.
A replacement lithium battery (pn 13519) can be purchased from Campbell
Scientific or another supplier. Table Internal Lithium-Battery Specifications
(p. 422)
lists battery specifications.
Table 112. Internal Lithium-Battery Specifications
Manufacturer Tadiran
Model TL-5902S (3.6 V)
Capacity 1.2 Ah
Self-discharge rate 1%/year @ 20°C
Operating temperature range -55°C to 85°C
Figure 133: Loosening thumbscrews
Turn off the CR3000 by switching off power at the switch located on the base,
and / or remove the external power connection. Loosen the two thumbscrews on
the face of the CR3000 and remove it from the base. If the CR3000 has a battery
base, carefully disconnect the internal power plug that connects the base to the
CR3000 module.