Chapter 3: Understanding the logger
14 HOBO Energy Logger Pro User’s Guide
• Verify that the batteries’ “Use Before” date is at least two years from the current date.
• Alkaline batteries will lose up to 10% of capacity per year if they are sitting on a hot shelf. They can lose
50% or more of their capacity if exposed to heat repeatedly (for example, stored on a car dashboard).
Keeping batteries in the refrigerator can reduce self-discharge to 1 to 2% per year, but you must prevent
condensation from forming on the batteries.
• Use new batteries if you expect the deployment to require a substantial portion of battery life.
External power sources
An external power source can reduce or eliminate the need for internal batteries in applications that have readily
available AC power, or require more current and/or longer deployments than the logger's internal batteries can
support. The logger can operate on a DC input voltage from several external sources including:
• Standard 12 V automotive/motorcycle type battery
• Sealed lead-acid (SLA) type 12 V battery (used in uninterruptible power supplies and emergency lighting
systems)
• External alkaline/lithium battery packs
• Optional AC power adapter (Onset part # P-AC-1)
There are two ways you can use an external power source:
• Battery eliminator mode - In place of the internal batteries. In this mode, the logger can operate on a DC
input voltage ranging 8 V – 15 V.
• Battery backup mode - To conserve the internal batteries as an automatic back-up supply if the external
supply should fail, similar to an uninterruptible power supply. To do this, you must provide a DC input
voltage greater than that of the internal batteries. Thus, a DC input voltage of 13.6 V – 15 V is required
for proper operation.
External power adapter specifications
• Able to deliver 750mA
• Positive outer sleeve
• 2.1 mm center pin diameter
• 5.5 mm outer sleeve diameter
• 10 mm outer sleeve length
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