Comark N9005 - Manual (Page 16)

15
14. SEALED FOR LIFE BATTERY
The N9005 and N9094 have a long life Lithium cell fitted
inside the sealed battery compartment on the reverse of the
instrument. This is designed to last up to 10 years in normal
usage. However should the symbol BAT appears on the display
when the battery voltage has reduced. Battery replacement
is recommended at this time. This can only be carried out by
Comark or Approved Distributor so please return the instrument
as appropriate for battery replacement.
Do not attempt to change the battery yourself as this will result
in damage to the instrument and a loss of waterproof rating.