Fronius Selectiva 4.0 2100 Operating Instructions Manual page 24

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Flashes briefly every 3s: The device outputs a warning. Charging paramet-
ers are unfavorable, but charging continues. The display alternately shows
the corresponding status code and the state of charge.
"Charge" indicator (yellow)
Lights up: during charging.
Flashes: when the charge has been interrupted.
"Battery is charged" indicator (green)
Lights up continuously: Charge complete.
Flashes every second: Charge complete. The water refill indicator has also
been activated.