Deeply Discharged Battery (Safety Charge)

What does 28 mean?

The connected battery is heavily discharged, meaning its voltage is significantly below its normal operating range. The charger has initiated a special 'safety charge' or 'recovery charge' phase at a very low current to safely bring the battery voltage up to a level where normal charging can begin. This is a protective measure to prevent damage to deeply discharged batteries.

• Battery has been left in a discharged state for an extended period
• High parasitic loads have completely drained the battery
• Faulty battery that cannot retain charge, leading to deep discharge

Click steps to track your progress.

1. 1

   Monitor the battery voltage to ensure it slowly rises during the safety charge phase

2. 2

   Do not interrupt the safety charge process; allow the charger to complete this phase automatically

3. 3

   If the battery voltage does not rise after a prolonged safety charge, the battery may be unrecoverable or faulty