Technician helping troubleshoot Motorola phone screen brightness not working

Steve H.

Reviewed for technical accuracy

Specialities: iPhone charging very slowly (Lightning/USB-C cables, adapters, dirty port, “Charging On Hold,” Optimized Battery Charging, battery health, safe checks).

iPhone charging slowly? Common reasons + safe checks (cable, port lint, heat, settings, battery health)

Technician avatar Technician
Hi — I can help. “iPhone charging very slowly” is a common panic-search, especially if you’re used to it topping up quickly.

We’ll keep this calm and low-risk. I don’t want you changing a bunch of settings or doing anything that could damage the charging port.

First, when you plug it in, what do you see on the screen?
• A normal lightning/charging icon?
• A message like “Charging On Hold”?
• Or it charges, but the percentage crawls up very slowly?

And which iPhone model is it (roughly), and are you using cable charging or wireless (MagSafe/Qi)?
Customer
It’s an iPhone, not brand new. I plug it in with the cable and it shows it’s charging, but it’s taking forever. I’m worried I did something wrong.
Technician avatar Technician
You didn’t do anything “bad” just by charging it. Slow charging usually comes down to one of these: the power source (weak adapter/USB port), the cable, the charging port, temperature (too warm/cold), or iPhone battery settings that pause/delay charging.

Quick, gentle questions (no changes yet):
1) Did this start suddenly, or has it been gradually getting slower?
2) Are you using a wall adapter, a computer USB port, or a power bank?
3) Do you remember if you updated iOS recently?
Customer
It started suddenly a few days ago. I usually plug it into a little USB thing on my lamp, or sometimes my laptop. I did update it recently, yes.
Technician avatar Technician
That helps a lot. Those lamp USB ports and some laptop ports can be low power, which often looks like “charging, but very slowly.” It’s not dangerous — just slow.

Trust moment: before we touch settings, we’ll check the simplest, safest things that can’t make your phone worse.

Safe check #1: when possible, try a known-good wall adapter (a regular phone charger that plugs into the wall) and a wall outlet you trust. If the speed improves there, we already know it’s the power source and not your iPhone.
Customer
I can try the wall. But what if the cable is the problem? It looks fine.
Technician avatar Technician
Great question. Cables can fail internally and still “look normal.” A safe way to test is simply swapping one piece at a time.

Safe check #2 (no force, no tools):
• Try a different cable you trust (if you have one).
• If possible, try a different wall adapter too.

If any one swap suddenly speeds up charging, you’ve found the weak link — without changing anything on the phone.
Customer
Okay. Another thing: sometimes the phone feels warm when charging. And it stops around 80% a lot.
Technician avatar Technician
That’s a very important clue — and it’s usually normal behavior, not a failure.

Two common iPhone features can make charging feel “slow”:
• If it’s warm, iPhone can slow charging to protect the battery (sometimes you’ll see “Charging On Hold”).
• If it pauses around 80%, that can be Optimized Battery Charging or a charge limit feature designed to reduce battery wear.

Trust moment: I don’t want you turning off battery protections just to make the number move faster. First we confirm what’s happening.
Customer
I’m not very good with settings. Is this from the update? I’m scared I messed up the battery.
Technician avatar Technician
You didn’t ruin the battery. Updates can make changes feel sudden because iPhone may re-learn your charging routine, and some battery features are more noticeable afterward.

Here’s a safe way to “separate” causes without digging deep:
Safe check #3: While charging, try not to use the phone heavily (video, games, navigation). Heavy use creates heat and slows charging. If charging is faster when the screen is off, that points to heat/workload rather than a broken charger.

If you ever see “Charging On Hold”, that specifically points to temperature protection.
Customer
I do watch videos while it’s plugged in. Also, the cable feels a little loose sometimes. Do I need to clean the port?
Technician avatar Technician
A loose feel can happen if there’s lint in the port — especially if the phone rides in a pocket or purse.

Important safety note: I don’t want you poking inside with metal or anything sharp. That’s how charging pins get damaged.

Safe check #4 (gentle): look into the charging port under good light. If you see obvious lint packed in, the safest route is either a very gentle, non-metal tool used carefully or having it cleaned by a professional. If you’re not 100% comfortable, skip this step — we can still learn a lot from cable/adapter testing first.
Customer
How can I tell if it’s the battery itself? The phone is older and the battery doesn’t last like it used to.
Technician avatar Technician
That’s a smart question. An aging battery can affect how iPhone behaves, including how it charges and how warm it gets.

Safe check #5 (information only): in iPhone Settings there’s a Battery Health area that shows the battery’s condition. You don’t have to change anything — it’s just a “report card.”

If the battery health is very low, charging can feel slower or less consistent, and the phone may warm up more easily. But we still rule out the easy causes (weak power source, cable, heat, port lint) first.
Customer
What should I do first today so I’m not stuck with a dead phone? I need it for calls.
Technician avatar Technician
Totally understandable — let’s focus on the fastest safe checks that help seniors avoid getting stranded.

Today’s calm order:
• Use a wall outlet + a solid wall adapter (not a lamp USB port or laptop) to see if it speeds up.
• If you can, try a second cable (even briefly) to compare.
• Charge with the screen mostly off for a while so it stays cooler.

That usually tells us whether it’s a simple power/cable issue or something the phone is managing (like heat or battery protection).
Customer
If it’s a setting like that 80% thing, is it bad? Should I turn it off?
Technician avatar Technician
It’s not “bad” — it’s often a battery-protection feature. Many people notice it more after an update or when their routine changes.

My advice for a safe approach: don’t turn anything off until we confirm what you’re seeing. If you regularly need a full charge at a specific time (like mornings), the phone may be delaying the last part on purpose.

If you tell me: (1) what power source you tested, (2) whether another cable helped, and (3) whether you see “Charging On Hold” or stopping at 80%, we can narrow it down without risky steps.
Customer
That makes sense. I’ll try the wall adapter and a different cable first. Thank you for not making me press scary buttons.

Quick answer: the accepted fix

Accepted first fix for an iPhone charging very slowly issue: confirm the easiest causes first (power source, cable, heat) before changing settings.

What usually helps most:
• Test with a reliable wall outlet + quality wall adapter (avoid low-power USB ports on lamps/laptops).
• Swap to a different cable you trust to rule out internal cable wear.
• If the phone feels warm, charge with the screen mostly off and watch for “Charging On Hold” (temperature protection).
• Check whether it pauses around 80%, which can be Optimized Battery Charging / charge limit behavior.
• If the connector feels loose, inspect the port for lint — but avoid sharp/metal tools; consider professional cleaning if unsure.

Why an iPhone charges slowly (and why it can start suddenly)

Slow iPhone charging often begins “out of nowhere” because one small change adds up: a different outlet, a weaker adapter, a worn cable, or a USB port that provides less power. It can also happen after an iOS update when battery protection features are more noticeable. Heat is another big factor — iPhone can slow or pause charging to protect the battery. And if charging seems to pause around 80%, that can be normal “battery health” behavior rather than a fault.

What to check first: charger/cable vs heat vs iPhone settings vs battery health

Start with the lowest-risk comparisons: switch to a known-good wall adapter and a trusted cable, then see if charging speed improves. Next, reduce heat by charging with the screen off and avoiding heavy use while plugged in. If you see “Charging On Hold,” temperature is likely involved. If it regularly slows or pauses near 80%, battery protection settings may be working as designed. Finally, check Battery Health for a general view of battery condition before considering service.

iPhone charging very slowly — gentle troubleshooting tips

Most slow charging is caused by a weak power source, a worn cable, heat protection, or battery settings like Optimized Charging.

Best approach: test a wall adapter and a second cable, charge with the screen off to reduce heat, and watch for “Charging On Hold” or a pause around 80%. Avoid digging into the charging port with sharp objects. Make one small change at a time, so you can clearly see what helped.

Disclaimer: This information is AI-generated and intended for general guidance only. Avoid making multiple system changes at once. For device-specific steps, consult a verified expert on Whizz-Tech or the manufacturer’s support before making decisions.

Additional troubleshooting options

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FAQ

Why did my iPhone start charging very slowly all of a sudden?

Sudden slow charging is often caused by a different power source (like a weak USB port), a cable that’s wearing out inside, or heat. iPhone can also slow charging to protect the battery, especially if it gets warm. After an iOS update, battery-protection features may be more noticeable. The safest first step is to compare a wall adapter and a second cable before changing settings.

My iPhone charging is slow after an iOS update — is that normal?

It can be normal. Some battery features (like Optimized Battery Charging or charge limits) may be easier to notice after an update or when your routine changes. iPhone may pause or slow charging to reduce battery wear or manage temperature. Check for “Charging On Hold” or a consistent pause near 80%. Start by confirming the charger and cable are strong enough, then review settings only if needed.

How do I know if it’s hardware or just settings / accessories?

If charging speed changes a lot when you switch outlets, adapters, or cables, it’s usually an accessory or power-source issue. If it slows mainly when the phone is warm or being used, temperature and workload are likely factors. If it consistently pauses near 80%, battery protection settings may be involved. Hardware becomes more likely if the connector feels loose, charging cuts in and out, or Battery Health is very low — but it’s best to rule out the easy causes first.

Can iPhone slow charging be fixed without going to service?

Often, yes. Many cases improve by using a reliable wall adapter, swapping to a good cable, and reducing heat while charging. If you suspect lint in the charging port, be careful — unsafe cleaning can cause damage, so professional help may be wiser if you’re unsure. If Battery Health is very low or charging is unstable no matter what you use, service may be the safer next step. Gather a few clear observations first so you don’t waste money.

Sources

Filed under: Battery & Charging

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