Power Bank Single Solid Light
Power bank showing only one solid LED — what it means at different battery levels, when to charge, and whether it can still charge your devices.
Solid
white
Quick info
Visual description
The power bank's LED display shows only one LED dot or segment lit, while the others are off. On a 4-LED power bank, one lit LED represents approximately 25% battery. On a 5-LED display, one LED = approximately 20%. The LED is steady and not blinking, distinguishing it from an actively charging or critically low state.
What it means
A single solid LED on a power bank is a clear, unambiguous indicator:
On a 4-LED bank: 1 solid LED = ~0–25% remaining charge. You have roughly one full phone charge left (for a 10,000mAh bank and a phone with a 3,700–4,000mAh battery).
On a 3-LED bank: 1 solid LED = ~0–33% remaining charge.
On a 5-LED bank: 1 solid LED = ~0–20% remaining. Time to recharge the power bank.
Single solid + one blinking LED: Some power banks use this combination to show finer granularity — solid LED = confirmed charge level, blinking LED = partial next level. One solid LED with one blinking = ~25–30% on a 4-LED bank.
During charging: Single solid LED during input charging = the power bank just started from empty. Normal.
Brand & model variations
The same light pattern can mean different things across manufacturers.
| Brand / Model | What white solid means | Recommended action |
|---|---|---|
Anker PowerCore 10000, 20000 | Anker uses 4 LEDs: 1 solid = 1–25%, 2 = 26–50%, 3 = 51–75%, 4 = 76–100%. Press power button once (without connecting anything) to check battery level. The LEDs light for 2 seconds then go off. | Press power button once to check level. At 1 LED, you have about 1 full charge of a modern smartphone. |
INIU B41, B63, 10000mAh | INIU uses 5 dots. 1 dot = 1–20%. INIU also blinks the single dot slowly when below 10%, and the dot is solid when between 10–20%. This lets you distinguish 'almost dead' from 'one charge left'. | 1 solid dot on INIU = about 20% = one full phone charge. 1 blinking dot = critically low, charge soon. |
Diagnose your issue
Answer a few questions to narrow down the cause.
Is the single remaining LED solid or blinking?
Safe next steps
Ordered from least to most involved. Check each step as you go.
Single solid LED = low but functional. Charge the power bank after this session.
Single blinking LED = critically low. Charge the power bank or it may die mid-session.
To check battery level without charging anything: press the power button once.
A power bank at 1 LED can still charge a phone but may auto-shut off if current draw drops to trickle mode (which some power banks interpret as 'charging complete').
When it resolves on its own
Condition: After recharging the power bank
Expected time: Approximately 2.5–3 hours to reach full charge on a 10,000mAh bank with a 2A adapter.
When to escalate
Stop troubleshooting and contact your ISP or manufacturer if:
- Power bank shows one LED right after a full charge cycle — battery capacity has degraded significantly.
- Single LED causes the bank to shut off immediately when connected to a device — voltage sag from aged battery cells.