Citizen bm8400-50a Guida Utente

If the charge becomes insufficient, a warning function will operate and the
display changes, as below.

6

One second
interval movement

Two second
interval movement

If charged
sufficiently

If insufficiently
charged

When the watch is exposed to light, the Quick Start Function will begin operating
and the  second hand will start moving. The correct time can be set once the watch 
is fully charged. 

If insufficient charge continues

If insufficiently charged and time is set