Android Phone Charging Slow After Update — 7 Fixes That Actually Work (2026)

By Saif Khan  |  TechFix Radar  |  Updated: July 2026  |  8 min read

You plugged your phone in last night the same way you always do. But since the latest Android update, it is taking three hours to charge instead of one. Nothing changed — same cable, same charger, same socket. But charging is suddenly crawling.

I have seen this exact complaint on Samsung Galaxy phones, Pixel devices, and Xiaomi handsets after nearly every major Android update for the past two years. The causes are predictable and the fixes are straightforward once you know what to look for.

Here is exactly what I found works — tested on a Samsung Galaxy A55, a Pixel 8a, and a Redmi Note 13 Pro.

⚡ Quick answer:Slow charging after an Android update is almost always caused by one of three things: (1) the update reset your fast charging settings back to off, (2) background processes from the update are running flat-out and consuming power as fast as it charges, or (3) the update changed USB settings. Fix 1 and Fix 2 together solve it for most people within 5 minutes.

📋 What's covered

1. Check if fast charging got turned off by the update
2. Wait for post-update background processes to finish
3. Check USB connection mode
4. Clear the battery cache
5. Check which apps are running after the update
6. Test with a different cable and charger
7. Recalibrate battery percentage
8. When slow charging means a hardware problem

First: Confirm It Is Actually Slow

Before troubleshooting, confirm the charging speed has genuinely changed — not just the percentage display behaving oddly after an update.

A simple test: plug in your phone at exactly 20% battery. Set a timer for 30 minutes. Check the percentage after 30 minutes.

Charging type	Expected gain in 30 min
Fast charging / Super fast charging (25W+)	30–50% gain
Standard fast charging (15–18W)	20–30% gain
Standard charging (5–10W)	10–15% gain
Slow / trickle charging (problem)	Less than 8% gain

Fast charging — 30–50% in 30 min ✅

Standard — 15–25% in 30 min ⚠️

Slow — under 8% in 30 min ❌ Problem

If you are getting less than 8% in 30 minutes on a phone that used to fast charge — something has definitely changed. Work through the fixes below.

Fix 1 — Check if Fast Charging Was Turned Off HIGH IMPACT ⏱ 2 min

FIX 1

Android updates sometimes reset fast charging to off

This is the most common cause — and the easiest fix. Major Android updates occasionally reset certain battery settings back to defaults, and on some phones, fast charging is turned off by default.

Samsung

Settings → Battery → More battery settings → Fast charging / Super fast charging → ON

OnePlus

Settings → Battery → Fast charge → ON

Xiaomi / Redmi

Settings → Battery & performance → Charging → Turbo charging / Fast charging → ON

Pixel

Pixel phones do not have a fast charging toggle — they manage it automatically. If your Pixel is charging slowly, skip to Fix 2.

After turning fast charging back on, unplug and replug the charger. You should immediately feel the charger get slightly warmer and the phone should show "Fast charging" or "Super fast charging" in the status bar.

💡 How to see charging speed on your Android: On most phones, pull down the notification shade while charging — it shows "Charging", "Fast charging", or "Super fast charging" below the battery percentage. If it just says "Charging" on a phone that used to say "Fast charging" — the toggle was reset.

Fix 2 — Wait for Post-Update Processes to Finish HIGH IMPACT ⏱ 0 min — just wait

FIX 2

The update is still running background tasks — consuming power

After a major Android update, your phone runs a series of background tasks that can take 30 minutes to several hours to complete:

• Re-optimising all installed apps for the new Android version
• Re-indexing media files
• Syncing contacts, photos, and app data
• Google Play updating all apps

During this time, the phone is consuming nearly as much power as it receives from the charger — which makes charging look impossibly slow. This is temporary and completely normal.

What to do:

1. After updating, plug the phone in
2. Leave it alone for 2 hours — do not use it
3. Background optimisation will complete on its own
4. Check charging speed after — it should be back to normal

If charging is still slow after 3-4 hours of being plugged in and untouched, move to the next fixes.

Fix 3 — Check USB Connection Mode HIGH IMPACT ⏱ 2 min

FIX 3

Wrong USB mode drastically reduces charging speed

When you plug your Android phone into a charger or PC, it chooses a USB connection mode. If it defaults to "File Transfer" or "MIDI" mode instead of "Charging only," charging speed drops significantly — sometimes by 60-70%.

Check what mode your phone is in:

1. Plug in your phone
2. Pull down the notification shade
3. Look for a notification that says "USB charging this device" or "File transfer" or "USB preferences"
4. Tap it
5. Select "Charging only" or "No data transfer"

Some Android updates change the default USB mode, which is why this starts happening after an update even though you did not change anything.

To permanently fix the default:

Settings → Connected devices → USB → Default USB configuration → Charging only

Path varies by manufacturer — search "USB" in your Settings search bar if you cannot find it.

Fix 4 — Clear the Battery Cache MEDIUM IMPACT ⏱ 3 min

FIX 4

Corrupted battery stats can cause charging to slow down

Android stores battery usage statistics in a cache. After a major update, this cache can become corrupted or mismatched with the new software, causing the system to throttle charging speed incorrectly.

On Samsung:

1. Go to Settings → Apps
2. Tap the three-dot menu → Show system apps
3. Search for "Battery" — tap on "Battery Manager" or "Battery Stats"
4. Storage → Clear Cache

Alternative method (works on most Android phones):

1. Power off the phone completely
2. Let the battery drain to 0% until it shuts off automatically (or as close as you can get)
3. Charge to 100% without interruption using the original charger
4. This recalibrates the battery stats

Fix 5 — Check Which Apps Are Draining Power After the Update HIGH IMPACT ⏱ 5 min

FIX 5

A misbehaving app after the update can consume power faster than charging

Sometimes an app becomes incompatible with a new Android version and starts using 100% CPU in the background — consuming power faster than the charger delivers it. Your phone is technically charging, but an app is eating the power as fast as it comes in.

Settings → Battery → Battery usage

Look at the top consumers. If any app you did not actively use is above 15-20% — it is misbehaving.

Fix it:

1. Tap the misbehaving app in battery usage
2. Tap Force Stop
3. Then go to the app in Settings → Apps → tap the app → Clear Cache
4. Check if an update is available for that app in Google Play

Common culprits after Android updates: social media apps (Facebook, Instagram), older banking apps, and apps that have not been updated in a year or more.

Fix 6 — Test With a Different Cable and Charger MEDIUM IMPACT ⏱ 5 min

FIX 6

Rule out the hardware before assuming it is a software issue

Sometimes the timing is a coincidence — the cable or charger started failing around the same time as the update, making it look like an update problem. A damaged USB-C cable or a worn charging port can cause slow charging that has nothing to do with software.

Test this:

1. Borrow a cable you know works well (same type — USB-C to USB-C or USB-A to USB-C)
2. Try a different charger if possible — ideally the original one that came with the phone
3. Try a different wall socket
4. Clean the charging port gently with a dry toothpick — dust and lint in the port is extremely common and reduces contact

If charging is significantly faster with a different cable — your cable is the problem, not the update.

⚠️ Cable quality matters a lot for fast charging. Cheap third-party USB-C cables often do not support fast charging protocols (USB Power Delivery or Qualcomm Quick Charge). Even if they charge the phone, they do it at 5W instead of 25W or 45W. Always use the cable that came with your phone or a certified replacement for full charging speed.

Fix 7 — Recalibrate Battery After the Update LOW IMPACT ⏱ 24 hours

FIX 7

Reset battery calibration for accurate readings

After a major Android update, the battery percentage display can become inaccurate — the phone thinks it is at 30% when it is actually at 50%, which causes it to behave as if it needs more charge than it does. Recalibrating fixes this.

1. Use your phone normally until the battery reaches 5% or lower
2. Plug in the original charger
3. Charge uninterrupted to 100% — do not use the phone while charging
4. Once at 100%, keep it plugged in for an extra 30 minutes
5. Unplug and use normally

Do this once after a major update. It resets the battery gauge and often makes charging feel faster because the percentage is now accurate.

Quick Reference — All 7 Fixes

Fix	What to do	Impact	Time
1	Turn fast charging back on in Settings	🔴 High	2 min
2	Wait 2–3 hours for post-update tasks to finish	🔴 High	0 min
3	Set USB mode to Charging Only	🔴 High	2 min
5	Find and force-stop rogue app in battery usage	🔴 High	5 min
4	Clear battery cache	🟡 Medium	3 min
6	Test different cable and clean port	🟡 Medium	5 min
7	Recalibrate battery (drain to 5%, charge to 100%)	🟢 Low	24 hrs

When Slow Charging Means a Hardware Problem

If all seven fixes above have not helped, the problem is likely hardware — not the update. Signs that point to a hardware issue:

• Charging port feels loose — the cable wiggles or falls out easily. The port pins may be bent or worn, reducing contact and charging speed.
• Phone gets unusually hot while charging slowly — could indicate a failing battery cell that is resisting charge.
• Charging percentage goes backwards while plugged in — the charger is not delivering enough power, or the port has a bad connection.
• Works fine with wireless charging but slow with cable — the USB-C port itself is damaged.

Charging port repairs typically cost $20-40 at a local repair shop and take about 30 minutes. If the phone is still under warranty, take it to the manufacturer — charging port issues are sometimes covered.

✅ Real example from testing: On the Redmi Note 13 Pro I worked on, the fast charging toggle had been reset to off by a MIUI update. Turning it back on immediately changed the notification from "Charging" to "Turbo charging" and the phone went from 0-100% in 4.5 hours to 55 minutes. That single toggle was the entire fix.

🏁 Start here

Go to Settings → Battery → look for a Fast Charging or Super Fast Charging toggle. If it is off — turn it on. That is the fix for the majority of people reading this. If it is already on, check USB mode (Fix 3) and battery usage (Fix 5). Give the phone 2-3 hours after the update before assuming something is seriously wrong — post-update background tasks genuinely slow charging down temporarily.

Frequently Asked Questions

Why did my Android start charging slowly after an update?

The most common reasons: (1) the update reset your fast charging toggle to off, (2) background app optimisation after the update is consuming power, or (3) the update changed your default USB mode from Charging Only to File Transfer. Fix 1, Fix 2, and Fix 3 cover all three of these and take about 5 minutes total to check.

How long does post-update background optimisation take?

On most phones, 1-3 hours. On phones with a lot of installed apps (100+), it can take up to 5-6 hours. During this time, the phone may feel warm and battery drain will be higher than normal. This is expected and not a sign of a problem. Leave the phone plugged in and untouched after updating.

Does Android 14 or 15 slow down charging?

Android updates themselves do not intentionally slow charging. But they can reset manufacturer-specific settings like fast charging toggles, and they trigger intensive background processes that temporarily consume a lot of power. Both issues are fixable without reverting the update.

My Samsung is charging slowly — where is the fast charging setting?

On Samsung Galaxy phones: Settings → Battery → More battery settings. You will see toggles for Fast charging, Super fast charging (on newer Galaxy S models), and Fast wireless charging. Make sure all relevant ones are turned on. This menu is sometimes called "Battery and device care" on newer One UI versions — tap Battery, then the three-dot menu for More settings.

Can a software update damage the charging port?

No — a software update cannot physically damage hardware. If your charging port has become loose or damaged around the time of an update, that is a coincidence, not a cause-and-effect. Physical port damage is caused by wear, dropping the phone, or inserting the cable at an angle repeatedly over time.

Is slow charging bad for battery health?

Slow charging is actually better for long-term battery health than fast charging — lower wattage generates less heat, which degrades battery cells more slowly. The problem is not that slow charging harms the battery — it is that your phone used to charge faster and now takes inconveniently long. Fix the speed issue using the steps above, but know that occasionally using a standard charger overnight is not harmful.

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Which fix worked for your phone? Let us know in the comments — especially if you have a less common brand or Android version. It helps other readers find the right fix faster.