Chapter 3: Understanding the logger
12 HOBO Energy Logger Pro User’s Guide
Selecting batteries
Onset recommends alkaline batteries for most applications because they are inexpensive, can provide more accurate
battery status readings in HOBOware Pro, and last longer than similar lithium batteries at moderate temperatures.
However, some applications or environments are better suited to other types of batteries. Refer to the following table
to determine which type of battery you should use.
Battery type Considerations for use
Alkaline These are best for most applications at moderate temperatures.
Alkaline batteries also work in temperatures ranging from 40° to 50°C (104° to
122°F) and from -20° to 0°C (-4° to 32°F), but may not perform as well as lithium
batteries at these temperatures.
At temperatures lower than -20°C (-4° F) and higher than 50°C (122°F), alkaline
batteries are not suitable. Use lithium batteries instead.
Enhanced alkaline
(such as
Energizer
®
E2 or
Duracell
®
Ultra)
Consider these for applications with higher sensor excitation requirements and
moderate temperatures. These batteries are specifically designed for high-current use.
For low-current applications, however, they offer little improvement.
Lithium (Li/FeS
2
) Lithium batteries last longer than alkaline batteries in applications with extreme or
varying temperatures (below 0°C/32°F or above 40°C/104°F). They also outperform
alkalines in deployments with high sensor excitation currents (>100 mA) or long
warmup times.
Lithium battery voltage does not vary much until the batteries are nearly depleted.
Because of the uncertainty in capacity, you may wish to start each deployment with
fresh lithium batteries that you know are at 100%, rather than rely on old ones.
Important: Do not use any other type of battery, such as carbon zinc (“heavy duty”) or rechargeables. These
batteries will not perform well and will not report their battery status accurately in HOBOware Pro.
WARNING: Fire, Explosion, and Severe Burn Hazard. Do not
mix battery types, either by chemistry or age; batteries may rupture
or explode. When replacing the batteries, read and follow their
disposal instructions; dispose of lithium batteries according to local
regulations. Do not dispose of batteries in fire. Never attempt to
recharge a lithium or alkaline battery. Do not heat the batteries
above 185°F (85°C). Do not mutilate or rupture the battery
housing. Lithium batteries may explode if the logger is exposed to
extreme heat or conditions that could damage or destroy the battery
case. Do not expose the contents of the battery to water.
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