Ferve F-2507, Instruction Manual

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The LED flashes at intervals of 1 second. If within a
period of 4 hours the flashing continues at intervals of
1 second, the battery cannot be recovered and must
be replaced. The battery may have been recovered
when the flashing is at intervals of 0.5 seconds (on) /
1 second (off).
To check whether the battery has been recovered, try
to start the charging process. If the LED POWER is on
solidly and it is not possible to select a charge mode,
replace the battery.
Press the MODE button until the LED turns on
(flashing light). The battery recovery process starts.