The battery compartment is located on the back of the MX40, accessible by
opening the compartment door from the bottom. It accommodates three
AA 1.5V Alkaline batteries or the Philips Rechargeable Lithium-ion battery.
Only these batteries should be used.
Note— Lithium-ion batteries should be fully charged prior to first use.
Important— Do not use other rechargeable batteries. Use of this type of
battery will adversely affect:
Battery gauge performance
Battery low warnings
Battery life performance
Insert the rechargeable lithium-ion battery using the
Open the battery compartment by lifting up on both bottom sides of the
Remove the AA battery tray if present.
Insert the battery pack so that the raised tab is aligned with the cutout
in the base of the battery compartment. Close the battery compartment