The manual specifies the following display readings. If you see something unexpected, here is the decoder:
| Display Reading | Meaning | Action Required | | :--- | :--- | :--- | | FLO (Flooded) | Indicates Standard battery type selected | No action; normal operation | | SUL | Battery is Sulfated (left dead too long) | Charger will attempt desulfation for 1 hr. If it fails, replace battery. | | Err (or F01) | Reverse polarity (Clamps are backwards) | Immediately swap the red/black clamps. | | F02 | Short circuit in clamps or dead battery cell | Inspect cables. If cables are fine, battery is dead. | | F03 | Battery voltage too low to accept charge (<2V) | Battery is likely beyond recovery. Replace. | | --- (or blank) | Battery voltage is extremely low | Try a different battery; this unit may not recover stone-dead batteries. | | 12.6v - 12.8v | Normal full charge (Float mode) | Disconnect or leave on maintainer. | everstart 6811a smart charger manual
The Everstart 6811A (often found at Walmart) is a fully automatic, microprocessor-controlled battery charger and maintainer. Unlike the "dumb" chargers of the past that could overcharge and ruin a battery, the 6811A uses a multi-stage smart charging algorithm. The manual specifies the following display readings
Key Specifications (From the Original Manual): The Everstart 6811A (often found at Walmart) is
The phrase "smart" means you can "set it and forget it." Once the battery is full, the unit switches to float mode (maintenance) to keep the battery at optimal voltage without cooking it.
⚠️ WARNING: Working near a lead-acid battery is dangerous. Batteries generate explosive gases. Read your battery manufacturer’s safety data.
If the screen flashes an unusual number, here is what the manual would tell you: