Please take a moment to watch the video below for step-by-step guidance, or follow the step-by-step written directions.

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1. Understand what battery voltage actually means

Battery voltage is basically a signal of how strongly ions inside the battery want to move between the positive and negative sides.
As a battery discharges, that “push” usually changes—depending on the chemistry.

2. Know the difference between lead-acid and lithium batteries

Lead-acid batteries:
- Voltage steadily drops as the battery discharges because the electrolyte changes as energy is used.
Lithium iron phosphate (LiFePO₄) batteries:
- Voltage stays mostly steady over most of the discharge cycle.

3. Recognize the “flat voltage zone” in lithium batteries

From about 100% down to ~20% charge, voltage only changes slightly.
Example range: roughly 13.6V down to about 13.0V.
This means the battery can be very full or only half full, and the voltage may look almost identical.

4. Don’t rely on voltage alone to measure charge

5. Use a proper battery monitoring method

6. Pay attention near the low-charge “drop zone”

Around 20% state of charge, voltage starts dropping quickly.
Near empty:
- Around 12.8V and falling
- Can reach ~12.0V or lower at full depletion
Avoid regularly running the battery into this zone.

7. Understand why the flat voltage curve is actually good

Benefits of lithium’s stable voltage:
- Lights stay bright until the end
- Devices run at full power consistently
- No gradual “slow down” like lead-acid batteries

8. Key takeaway

Lithium batteries give steady performance, not steady voltage readings.
The flat voltage curve is a feature, not a flaw—but it requires proper monitoring to use correctly.

Why does my lithium battery voltage stay the same even when it’s discharging?