Epson TM-P20 Technical Reference Manual page 25

Mode 2
Battery LED
Level H
Level M
Level L
Level S
Level E
Remaining
Error LED
battery charge
Approx. 60  100%
Approx. 40  60%
Approx. 20  40%
Approx. 10  20%
Approx. below 10%
Chapter 1 Product Overview
: On : Flash
Printing Communication
Possible Possible
Possible Possible
Possible Possible
Possible Possible
Impossible Impossible
: Off
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