ARISSat-1 Battery is Failing Faster than Expected

ARISSat-1 Battery is Failing Faster than Expected

The ARISSat-1 battery performed as expected during the first week of
operation. Lower voltages during eclipse began to show up in the
telemetry on 10 Aug 2011. The voltages during eclipse have continued
to decline causing the satellite to reset and go into Emergency Power
Mode on 12 Aug. After reset, the satellite MET (Mission Elapsed Timer)
goes to 000, waits during the 15 minute TX delay, the power management
software checks the current voltage and power values and determines
what power mode to operate the satellite. The power mode is
re-determined at fixed intervals, especially during illuminated
periods to provide the most transmitted signals while protecting the

Additional information and explanation about the workings of the
ARISSat-1/RadioSkaf-V power system can be found on the
web site under the FAQ section.

The ARISSat-1 team is closely monitoring the situation and is pleased
with how well the power management software is controlling the battery
usage to prolong the lifetime of the battery and the satellite as much
as possible.