What Does This Error Mean?

Portable power station displaying an inaccurate battery percentage is usually a battery calibration issue — the BMS (Battery Management System) has lost track of the true capacity. Perform a full discharge to near-zero followed by a full uninterrupted charge to recalibrate the display.

Affected Models

Jackery Explorer series
EcoFlow Delta series
Bluetti AC series
Goal Zero Yeti series
All portable power stations with LCD/LED display

Common Causes

Battery calibration drift — BMS loses accuracy after many partial charge cycles
Battery age — capacity has degraded and the display still shows old full-capacity readings
Displayed watts-in vs. watts-out not matching real draw — display lag during load changes
Display showing input power instead of battery percentage during simultaneous charge/discharge
Cell imbalance in a lithium battery pack causing erratic percentage readings

How to Fix It

Perform a full calibration cycle.

Discharge the power station completely by running a load (a lamp or fan) until it shuts off automatically. Then charge it from 0% to 100% in one uninterrupted session without using it during charging. This full cycle allows the BMS to re-learn the battery's true capacity and recalibrate the percentage display.
Avoid partial charge cycles.

Lithium iron phosphate (LiFePO4) and lithium-ion power stations lose display calibration when frequently partially charged — e.g., 30% to 80% repeatedly. Occasionally doing a full 0–100% charge cycle (once per month) keeps the BMS calibrated and the display accurate. Partial cycles are fine for battery longevity but require periodic full cycles for display accuracy.
Understand display behavior during simultaneous charge and use.

When charging the power station via solar or AC while also running devices, the display may show erratic readings. The displayed wattage in and out are calculated separately — the net effect on battery percentage may lag by several minutes. This is normal behavior and not a fault — wait a few minutes with a steady load for the display to stabilize.
Update the firmware.

Check the manufacturer's app (EcoFlow app, Bluetti app, Jackery app) for a firmware update for your unit. Firmware updates frequently fix BMS calibration bugs that cause inaccurate percentage readings. Connect the power station to Wi-Fi or Bluetooth and follow the update prompt in the app.
Accept capacity reduction as normal aging.

Lithium batteries lose capacity over time — typically 80% of original capacity remains after 500–1000 full charge cycles (varies by chemistry). If the display shows 100% but runtime has shortened, the battery has aged and now 100% represents less total energy than when new. This is normal — the display is accurate for the current state; the battery itself has less capacity.

When to Call a Professional

If the display consistently shows 100% but the station shuts down after 10 minutes of use, the battery cells have significantly degraded. Contact the manufacturer — this may be covered under the warranty's battery capacity guarantee.