Error Code Battery Status Icon flashing (empty)

Battery is nearly empty or completely empty — unit's built-in low voltage protection activated.

? What Causes This

Battery charge level critically low (1 solid bar or 4 empty bars on battery icon).

Stop all operations immediately.
Recharge the unit fully using the supplied AC charging adapter for approximately 20 hours.
Do not attempt to operate unit until fully charged.

Source: page 7 of the official manual

From the manual

This error code appears in: