Fronius Acctiva Smart 25 A Instructions De Service page 73

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If the battery is in a state of extreme deep-discharge (under 2 V), a warning appears in-
structing the user to disconnect the battery.
Batteries in a state of extreme deep-discharge must be replaced without using Battery
changing mode.
Install and connect a new battery
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WARNING!
Danger following ignition of oxyhydrogen caused by sparks resulting from the
charging leads being disconnected too soon.
This can result in serious injury and damage to property.
► Before disconnecting the charging leads, press the Stop/Start button to finish buffering.
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Disconnect the charger
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- Disconnect the black charging lead from the negative (-) vehicle charging lead
- Disconnect the red charging lead from the positive (+) vehicle charging lead
Remember:
Start charging mode to charge the (as yet not fully charged) battery.
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Set the correct battery voltage using the Up/Down keys (6V /
12V / 24V).
Confirm the selection using the Stop/Start key.
To cancel Battery changing mode:
Press the Stop/Start key
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