Huawei P9 Charges Slowly? Fixes That Work

Updated 14 November 2026 · Standard formula, shown below

If your Huawei P9 is charging slowly, the most likely causes are a worn charging cable, a dirty charging port, or a faulty battery, and the fix usually starts with cleaning the port and trying a different cable and adapter. This guide walks through the most effective solutions step by step, from simple cleaning to software checks, so you can get back to a normal charging speed.

Why the Huawei P9 Charges Slowly

The Huawei P9 supports fast charging up to 18W (9V/2A) with the original charger and cable. If you’re not seeing those speeds, something in the chain is limiting power delivery. Common culprits include:

Damaged or low-quality USB cable – cables degrade over time, and cheap replacements often lack the correct gauge wire for fast charging.
Dirty or lint-filled charging port – debris can block the connector from seating fully, increasing resistance.
Third-party charger or power bank – many don’t support Huawei’s fast-charging protocol (Huawei SuperCharge or FCP).
Background apps and high battery temperature – heavy usage while charging can slow the charge rate to protect the battery.
Battery wear – after years of use, the battery’s internal resistance rises, reducing charge speed.

Step-by-Step Fixes to Try

Work through these in order – most people find the fix in the first few steps.

Clean the charging port. Power off the phone, then use a wooden toothpick or a soft plastic pick to gently scrape out lint from the bottom of the port. Do not use metal tools or blow compressed air directly, as you can damage the connector pins.
Try a different cable and adapter. Use the original Huawei charger if you have it. If not, use a cable rated for at least 2A and a charger that supports 9V/2A output. Test with another USB port or wall socket.
Restart the phone. A simple reboot clears software glitches that can interfere with charging detection.
Enable airplane mode while charging. This cuts background radios, reducing power draw and heat, which can speed up charging.
Check for system updates. Go to Settings > System > Software update and install any pending updates. Huawei has released fixes for charging-related bugs in the past.
Calibrate the battery. If the charge percentage seems stuck or inaccurate, let the phone drain to 0% until it powers off, then charge it to 100% uninterrupted. Do this once a month if needed.

How to Check if Fast Charging Is Actually Working

When you plug in a compatible charger, the P9 should show a notification that says “Fast charging” or “SuperCharge” on the lock screen. If you don’t see that, the phone is charging at standard 5V/1A or 5V/2A speeds. You can also use a USB power meter (a small device that plugs between the cable and phone) to see the actual voltage and current. With the original charger and a healthy battery, you should see around 9V and 2A (18W). If you see 5V and 1A, the fast-charging protocol isn’t being negotiated.

Common Mistakes That Slow Charging

Using a wireless charger – the P9 doesn’t support wireless charging, so this isn’t applicable, but some people mistakenly use a Qi adapter that charges slowly.
Charging from a laptop USB port – most laptop ports deliver only 5V/0.5A, which is extremely slow.
Leaving the phone in a hot car or direct sunlight – high temperatures trigger thermal throttling, reducing charge speed to protect the battery.
Using the phone while charging – playing games or streaming video draws more power than the charger can supply, so the battery percentage may even drop.

When to Replace the Battery or Charging Port

If cleaning and cable swaps don’t help, the battery may be worn out. Lithium-ion batteries degrade over time – after 500 charge cycles, capacity typically drops to about 80%, and internal resistance rises, slowing the charge rate. If your P9 is more than 2-3 years old, a battery replacement is a reasonable next step. A qualified technician can also inspect the charging port for bent pins or corrosion, which can cause slow or intermittent charging. If the port is damaged, it may need replacement – this is a delicate repair best done by a professional.

How to Prevent Slow Charging in the Future

Use the original charger and cable, or a certified third-party alternative that supports Huawei’s fast-charging protocol.
Keep the charging port clean – check it every few months for lint.
Avoid charging in extreme temperatures (below 0°C or above 35°C).
Don’t let the battery drain to 0% regularly; keep it between 20% and 80% for daily use.
If you notice the phone getting hot while charging, unplug it and let it cool down before resuming.

Frequently Asked Questions

Why does my Huawei P9 charge slowly even with the original charger?

If the original charger and cable are in good condition, the issue is likely a dirty port, a software glitch, or battery wear. Clean the port, restart the phone, and if the problem persists, consider a battery replacement – especially if the phone is several years old.

Can I use a fast charger from a newer Huawei phone?

Yes, Huawei’s SuperCharge chargers are backward compatible, but the P9 will only draw up to 18W (9V/2A). A 40W charger will still work, but it won’t charge the P9 faster than 18W.

Is it safe to charge my P9 with a non-Huawei charger?

It’s safe as long as the charger is from a reputable brand and supports at least 5V/2A output. However, it may not trigger fast charging if it doesn’t support Huawei’s Fast Charge Protocol (FCP). Avoid very cheap, unbranded chargers – they may not regulate voltage properly, which can damage the battery.

How long should a Huawei P9 take to charge fully?

With the original 18W charger and a healthy battery, the P9 (3000 mAh) typically charges from 0% to 100% in about 1.5 to 2 hours. If it takes significantly longer, something is wrong.

Does turning off the phone charge it faster?

Yes, turning off the phone or enabling airplane mode reduces background power consumption, so more of the charger’s output goes into the battery. You may see a 10-20% reduction in charging time.

My phone says “charging slowly” – what does that mean?

This message usually appears when the charger or cable can’t deliver enough current (e.g., a 5V/1A charger). It’s a warning, not a malfunction. Switch to a charger that supports at least 5V/2A to get normal speeds.

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