Seiko DPU-414 User Manual page 31

When the Battery Gets Low During Printing
When the power lamp starts blinking about once every 0.5 seconds and
the printer goes OFFLINE, connect the AC adapter.
The ONLINE lamp will blink if there is data left in the memory buffer. In
order to print the remaining data, connect the AC adapter as quickly as
possible and push the ONLINE button.
NOTE
Battery efficiency will decrease if battery is recharged more than
necessary. Confirm whether power lamp is blinking and battery
charge has decreased before recharging battery.
When using the rechargeable battery:
Turn off the power switch after use.
Leaving power switch ON will consume battery and eventually run
battery out, leading to low performance and malfunction.
When using the AC adapter:
The battery gradually recharges regardless of whether or not the
power is on/off. If you are not using the printer, turn off power
switch, and unplug the AC adapter.
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