Campbell Scientific CR3000 Micrologger - Manual (Page 85)

Section 7. Installation
85
8. Check for normal datalogging function before leaving the site.
Table 4. Alkaline Battery Service and Temperatures
Temperature (°C) % of 20°C Service*
20 - 50 100
15 98
10 94
5 90
0 86
-10 70
-20 50
-30 30
*Data based on one "D" cell under conditions of 50-mA current drain with a 30-ohm load. As the
current drain decreases, the percent service improves for a given temperature.
Figure 30: Alkaline battery orientation
7.4.3.2.2 Sealed Rechargeable-Battery Base
A CR3000 with a rechargeable base option (see the appendix Battery Bases
(p. 567)
) has an integrated power supply that utilizes two 6-Vdc, 7-Ahr, sealed-
rechargeable lead-acid batteries, an ac-to-ac transformer (18-V RMS-ac output),
and a temperature compensated charging circuit with a charge-indicating LED.
An ac transformer or solar panel should be connected to the base at all times
through the green CHARGING INPUT connector located on the side of the base.