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Stap 2
Remove bottom cover and set aside the red power switch. Open the inner case, using a flat blade screwdriver to open three plastic latches.  Expose the circuit board and batteries. Measure and record the old battery voltages, with the power switch firmly OFF.   A new battery is about 3.3 volts, the bad ones seem to be about 2.8 volts.
Disassemble
  • Remove bottom cover and set aside the red power switch.

  • Open the inner case, using a flat blade screwdriver to open three plastic latches. Expose the circuit board and batteries.

  • Measure and record the old battery voltages, with the power switch firmly OFF. A new battery is about 3.3 volts, the bad ones seem to be about 2.8 volts.

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