Owner manual

KEW3128 73
KEW3128 7. Battery Charging and Replacement
  ④ Pull out the Tray toward, and take the battery out.
  ⑤  Pull up the Battery Connectors upward as indicated by arrow mark in
the below left illustration, and remove them.
  ⑥  Remove the old battery and install a new one (rechargeable lead
storage battery PXL-12050: 12V 5Ah). Check the orientation of the
connectors (see above illustration on the right) and no deformation on
the metal terminals and install a battery in correct polarity. Then, insert
the Tray fully.
  ⑦  Install the Battery Compartment Cover so that the surfaces of the Cover
and the instrument become flat, and fix it with screws.
+ (positive)
red
- (negative)
black