Hi! I understand your JBD BMS battery is stuck in the "ZZZZ" sleep mode and only wakes up when you plug in the charger. Let's work through this together to get it active again.

To start, could you tell me:
- How long has the battery been in this sleep mode?
- What voltage level is the battery showing currently (if you can check via the app)?
- Have you tried any particular steps so far to wake it other than plugging in the charger?

In general, the JBD BMS enters sleep mode to protect the battery if voltage is too low; it automatically wakes when voltage rises with charging. Sometimes, if the battery voltage is below a certain threshold (for example, under about 24V for a 24V battery), it won’t wake up without an external charge applied.

Here’s a step-by-step approach to try:

1. Connect a Charger: Since you’ve confirmed it wakes with the charger connected, leave the charger connected at an appropriate voltage for your battery pack (e.g., a charger matching your battery’s nominal voltage). This should help the BMS voltage rise above the wake threshold.

2. Measure Voltage: While charging, monitor the voltage rising on the BMS app or a multimeter. Once voltage is above the threshold (often around 24V for a 24V pack or roughly the nominal system voltage), the BMS should automatically wake fully from sleep.

3. Check PROT State in App: In the JBD BMS app, look for a page or section called “PROT state” or “Protection State”. This will tell you if the BMS has registered any overdischarge or cell imbalance errors preventing normal operation.

4. Perform a System Reset: If the BMS stays asleep after sufficient charging voltage, check if the app has a reset or reboot option. Some users report being able to force the BMS out of sleep mode with a system reset from the app.

5. Check Wiring and Balance: Confirm cell connections and cell voltages look balanced because imbalance or faulty wiring can cause the BMS to stay asleep as a protective action.

6. Leave It Charging for a While: Leaving the battery connected to a charger for an extended time (several hours) can help fully wake it up and balance cells.

If after trying these steps the battery still stays stuck, it might be due to a deeper issue like:
- Cells overdischarged to a very low voltage (which can sometimes cause the BMS to lock out).
- Faulty BMS firmware or hardware needing an update or reset.

In such a case, please let me know:
- Your battery configuration (number of cells, voltage),
- The charger specifics,
- What readings and messages the app shows exactly.

I’m here to assist you through this, so just update me on what you observe, and we’ll take the next steps.

For further reading or similar reported cases, you might find these links useful:
- DIY Solar forum discussing BMS sleep mode: 1
- Video about waking up JBD BMS: 3

Are you satisfied with this initial guidance? If not, I’m happy to dive deeper!