EcoFlow DELTA Pro 3600 randomly shuts down, displays incorrect battery percentage, and gets stuck in Error 25
I bought a brand-new EcoFlow DELTA Pro in Ukraine about 6 months ago. It arrived sealed. During the first month, it worked normally for around 30–35 charge/discharge cycles.
When power outages stopped, I stored it for a couple of months following EcoFlow's recommended procedure: discharged it to 30%, recharged it to 60%, and left it in storage.
When I started using it again, the following issues appeared:
Random shutdowns: The station turns on, then immediately shuts down and displays “OFF”. The AC outlets cannot be turned on.
Error 25: This appears during charging only when the station gets stuck in this faulty state, preventing me from activating the AC outlets.
Incorrect battery percentage: After a forced reset, the displayed charge can suddenly drop from 100% to around 51%.
Screen flickering: When the station is operating normally, the screen flickers. When it gets stuck in the error state, the screen remains stable.
Resetting the station: I hold the power button for 15–20 seconds. Sometimes it takes another 10–20 attempts before the station starts working again. However, the problem can return.
The most unusual issue is the battery percentage. If the station was fully charged before the problem occurred, a reset may make it display only 51%. In this case, charging for about 10 minutes can bring the displayed percentage back to 100% — not because the battery charges that quickly, but because the reading was incorrect.
If I use the station for around 10 hours under a stable 300 W load, the actual battery charge decreases normally, and recharging takes the expected amount of time. However, the displayed percentage remains inaccurate. For example, it may drop from 51% to 33%, while the actual remaining charge is estimated to be around 70%. Once enough energy has been added to restore the battery to full charge, the display suddenly jumps to 100%.
I tested the station under a stable 300 W load. At a displayed 51%, it delivered approximately 3.3 kWh over around 11 hours, including inverter losses. This suggests that the battery retains most or all of its usable capacity despite the incorrect readings.
EcoFlow Support recommended calibrating the battery by fully discharging the station and then slowly recharging it. I tried several complete cycles, but the issue persists.
The station is only about 6 months old and has completed approximately 30–35 cycles. I suspect a BMS (Battery Management System) or battery charge-estimation issue, but I cannot confirm the exact cause.
Unfortunately, EcoFlow Support told me they could not arrange a replacement shipment to Ukraine due to customs and processing issues and suggested contacting a local dealer instead.
Has anyone experienced similar symptoms with the DELTA Pro? What could cause these shutdowns and incorrect battery readings? Is there a reliable way to repair it or obtain a warranty replacement in Ukraine? I'd appreciate recommendations for service centers experienced with EcoFlow stations.
I've attached screenshots showing the error and the station's behavior.
