Power Bank Not Charging: How to Reset Your Portable Charger

Updated 2026-09-18 · Power Bank Guide

Why Resetting a Power Bank Matters

When a portable charger stops giving juice, the first step is often a reset. Most power banks use a simple on/off button or a combination of button presses that clears internal error states and restores normal operation. Resetting can fix issues like a stuck “low battery” indicator, a dead LED, or a non‑responsive USB port. Because the process is quick and risk‑free, it’s the go‑to troubleshooting step before opening the unit or buying a new one.

How to Reset Power Bank

The exact reset method varies by brand, but the common patterns are:

• Standard on/off button: Hold the button for 5–10 seconds until the LED flashes or the unit powers down, then press again to restart.
• Double‑tap or long‑press combo: Some models require a quick double‑tap followed by a long press. Check the manual or look for a small reset pinhole on the casing.
• Power cycle with a charger: Plug the charger in, wait 10 seconds, unplug, wait 5 seconds, then plug back in.

After resetting, wait a minute for the internal circuitry to re‑initialize. If the device still shows a low‑battery icon or fails to output power, move to the next troubleshooting step.

Common “Not Charging” Fixes

Below are the most frequent reasons a power bank may refuse to charge a phone and how to address them.

1. Check the output voltage and current: A 22.5W USB‑C PD bank delivers 5V/3A, 9V/2.5A, or 12V/1.875A. If your phone’s USB‑C port only supports 5V/1A, the bank may default to a lower wattage that appears “not charging” on some devices. Try a standard USB‑A cable and adapter to see if the phone accepts power.
2. Inspect the cables: Faulty or frayed cables can cause a power drop. Use a cable that matches the bank’s output spec. The INIU 20000mAh comes with a USB‑C cable that supports 22.5W, which is ideal for modern smartphones.
3. Remove any protective overlays: Some banks have a plastic guard over the USB port to prevent dust. Remove it before connecting.
4. Reset the bank: As described above, a quick reset often clears a software glitch that blocks output.
5. Check the battery level: If the bank’s internal battery is below the threshold (often 10–20%), the device may shut down to protect itself. Let it charge fully with a wall charger first.
6. Update firmware: A few models allow firmware updates via a companion app. Keeping the firmware current can resolve output issues.

Battery Health and Lifespan

Portable chargers use lithium‑ion cells that degrade over time. To maximize lifespan:

• Keep the charge level between 20% and 80% whenever possible.
• Avoid deep discharges (below 10%) and overcharging (above 95%).
• Store in a cool, dry place; high temperatures accelerate capacity loss.

For a 20000mAh bank (~74Wh), the real‑world usable capacity is about 60–70% due to conversion losses. That means you can expect roughly 44–52Wh of usable power, enough for:

• iPhone 17 (~10Wh per charge) – about 4–5 full charges.
• Samsung Galaxy S24 (~12Wh) – about 3–4 full charges.
• Google Pixel 8 (~11Wh) – about 4 full charges.

Safe Storage and Overheating Prevention

Overheating can trigger safety shut‑offs that make the bank appear dead. Store the unit in a ventilated area and avoid placing it in direct sunlight or on a hot surface. If the bank feels warm after a charge cycle, let it cool before using it again.

Airport and Travel Safety

Most airlines allow power banks under 100Wh in carry‑on luggage, so a 20000mAh (~74Wh) model is safe for most flights. However, rules can change, and some airlines require you to declare the device. Always check the current TSA and airline guidelines before traveling.

The INIU 20000mAh Portable Charger is specifically designed to meet TSA flight‑safe criteria. It’s compact, includes a USB‑C cable and a handy flashlight, and can charge an iPhone 17, Samsung, Xiaomi, or Google phone multiple times on a single charge.

Cleaning and Maintenance

Keep the USB ports dust‑free with a soft brush or compressed air. Never use liquids on the electronics. If the ports are sticky, wipe them gently with a dry microfiber cloth.

FAQ

What should I do if my power bank still won’t charge after a reset?

Try a different cable and adapter. If the issue persists, the internal battery may be depleted or damaged. Contact the manufacturer’s support line for a warranty claim.

How many charges can a 20000mAh power bank provide for my phone?

With typical 60–70% efficiency, you can expect about 4–5 full charges for an iPhone 17, 3–4 for a Samsung Galaxy S24, and 4 for a Google Pixel 8.

Is it safe to use a power bank in extreme temperatures?

No. High heat (above 40°C) or extreme cold (below 0°C) can damage the lithium‑ion cells. Store and use the bank within the 0–40°C range for optimal safety and performance.