Seintek S2800 User Manual page 15

Note
If the meter reads negative, the battery has been reverse charged (has reversed polarity) and
should be replaced, or the meter has been connected incorrectly.
Battery voltage (V)
12.6 or higher
12.4
12.2
12.0
11.9 or lower
6
⑥
Check the measurement voltage.
State of charge
100% charged
2-10
75% charged
50% charged
25% charged
Discharged