Victron energy Blue Smart IP67 Manual página 17

When a battery reaches the end of its cycle- or float life, or when it
dies prematurely due to sulfation or corrosion, capacity will
dramatically drop and internal resistance will increase. The charger
will not recognise such a battery during the test phase (it could as
well be a nearly fully charged battery).
A very short bulk phase when charging a supposedly discharged
battery does however indicate that the battery has reached the end
of its useful life.
Remark: sulfation can sometimes be partially reversed by repeated
application of the RECONDITION MODE.
3.7 Can be used as a power supply
The charger will supply DC loads when no battery is connected.
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