VeriFone Commander Hardware Installation Manual page 4

Battery Charging Notification
The unit should be powered up for at least 24 hours prior to initial
application download. This is to prevent loss of data and to ensure
that the battery pack is fully charged.
Important Information
Changes or modifications not expressly approved by VeriFone, Inc.
could void the user's authority to operate this equipment.
This equipment is not intended to be repaired by the user.