NTi Audio Acoustilyzer AL1 - Manual (Page 12)

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Battery Replacement
After unpacking, insert three (3) 1.5 V alkaline batteries, type AA, LR6, AM3
into the AL1 battery compartment as shown below. The typical life-time for
a set of alkaline batteries is 16 hours.
Notes:
• We do not recommend the use of rechargeable NiCd- or NiMH-
batteries.
• Do not insert batteries of different types.
• Replace all batteries at the same time - never mix old and new
batteries.
• Ensure the correct polarities of the inserted batteries.
• Remove the batteries as soon as they are flat or if it is not intended
to use the instrument for an extended period of time.