Delta-T Devices SunScan SS1 User Manual page 63

SunScan Probe SS1-RL4
The probe is powered by 4 x AA cells. These should give about 500 hrs
operating time with radio usage.

Replace the batteries when the level has fallen near to 5 V (or 4.7 V
level for non-radio operation).
BF5 radio transmitter BF5-RL4
The transmitter is powered by 4 x AA cells. These should give 500 – 1000
hrs operating time. To check the battery:

Depress the on/off button. After a few seconds the red LED will flash
at 3-second intervals.

If no flash occurs, undo the four case screws, and fit or replace the 4
alkaline AA cells in the battery holder.

For an indication of the remaining battery life, you will need a
voltmeter. Open the case, and measure the battery voltage with the
transmitter module powered.

Replace the batteries when the voltage nears the recommended end
point of 5V.
Sunshine Sensor BF5
The BF5 is powered by 2 x AA cells. These should give typically about
one year's lifetime. (The BF5 battery check is fully detailed in the BF5
manual.)
To check the battery voltage:

Run SunRead in your PC and communicate with the BF5 through its
RS232 cable. The battery voltage is reported.

Alternatively, open the BF5 case (undo the four corner screws) and
measure the BF5 battery voltage with a voltmeter.

Replace the batteries when their voltage drops to 2 V.
SS1 User Manual v3.3
Technical Reference  63