Before changing the battery pack clean the WHT to avoid contamination of the contacts.
6.1 Removal of battery pack
To remove the battery pack for replacement, or charging, remove the plastic cover from the top and turn the locking screw 90 degrees anticlockwise to
release the battery pack (release position displayed in the diagram below). Then pull the battery pack from the WHT.
6.2 Fitting a battery pack
Push the battery pack onto the WHT body, ensure that the locking screw is orientated as shown in the diagram (release position slot in line with charging con-
nector); turn the locking screw through 90 degrees in a clockwise direction to latch the battery pack (locked position). Replace the plastic cover.