How long is the battery life of an AvaTrace M40?

Temperatures above freezing: 70-100 days.
Temperatures below freezing: 2-4 weeks.

When measuring with up to 2 accelerometers the battery life time is reduced to 50 % of the given values above.
When measuring with more than 2 accelerometers the battery life time is reduced to 30 % of the given values above.