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User’s Guide
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HOBO U30 Station/RC
Stay within the normal operating temperature range
While the logger can operate at temperatures of -40 to 60 C (-40 to 140 F) the battery has much better
short and long term performance when maintained between -20 and 40 C (-4 and 104 C). The Sealed
Lead Acid will self-discharge. The hotter the battery gets, the faster it will self-discharge.
At 20 C, the battery loses about 20% of its capacity in 6 months, but at 50C it loses more than 50%.
To maximize battery life (no charging) try to locate the logger where the temperatures will not be above
40 C (104F). Very cold temperatures will reduce the self-discharge rate to almost zero, but the effective
capacity of the battery will be reduced. Temperatures below -20 C (-4 F) will reduce the effective battery
capacity by more than 25%.
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