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Understanding the Endurance Charger LEDs and charging stages

The Endurance Charger uses a seven-stage adaptive charging process. This article explains the different meaning behind the stages.

The Endurance Charger uses a seven-stage adaptive charging process. Its LEDs show the current stage and help you identify when a battery is ready for use.

Test/Charge

Before charging begins, the charger tests whether the battery can accept a charge. This includes batteries that are deeply discharged and have an open-circuit voltage close to 0 V.

The Test LED flashes until a charging pulse raises the battery voltage above 12.5 V or two minutes have elapsed.

If the charger detects a clear fault, such as reverse polarity or a short circuit, all charge-status LEDs will flash. Switch off and disconnect the charger immediately.

Bulk

During the Bulk stage, the charger supplies its maximum charging current until the battery reaches the configured absorption voltage.

At the end of this stage, a lead-acid battery is approximately 80% charged and can be returned to service if required.

Absorption (Abs)

During Absorption, the charger maintains the configured absorption voltage while gradually reducing the charging current as the battery approaches full charge.

The duration is adjusted automatically according to the battery's level of discharge. It can range from approximately 30 minutes to a maximum of eight hours.

Completing the Absorption stage regularly helps maximise battery life.

Float

The charger maintains the battery at the configured float voltage to prevent discharge.

When the Float LED is illuminated, the battery is fully charged and ready for use. The Float stage normally lasts between four and eight hours before the charger moves to Storage.

Storage

Storage mode uses a slightly lower voltage than Float. This minimises gassing and helps extend battery life while the battery is not in use.

A battery can remain connected in Storage mode for an extended period.

Refresh

While a battery remains in Storage mode, the charger automatically carries out a one-hour absorption charge every seven days. This helps offset slow self-discharge.

Recondition

Recondition is an optional corrective stage for lead-acid batteries affected by sulphation. It is not intended for routine use. See When and how to use Recondition mode before selecting it.