Check these before anything else
Take the case off. Move the phone until the charging indicator appears, then leave it exactly there. And check the power adapter feeding the charging pad — a pad rated for 15W plugged into an old 5W adapter will charge slowly or not at all. Case, alignment and power supply account for the clear majority of wireless charging failures, and none of them involve a fault in the phone or the pad.
How wireless charging actually works
A coil in the charging pad generates a magnetic field. A coil in the phone converts that field back into current. It is genuinely just induction, and understanding that explains every failure mode.
The two coils must be close together and roughly aligned. Distance matters enormously — efficiency falls off sharply with every additional millimetre, which is why a thick case can stop charging entirely. Anything metallic between the coils absorbs energy from the field instead of passing it through, which is why a card in a wallet case or a metal ring holder blocks charging and gets warm doing it.
And the whole process is inefficient compared with a cable. Some energy becomes heat rather than charge, which is why phones get warm on a pad and why they deliberately slow down when they do.
Isolate the problem
Remove the case and test
Do this first because it is free and decisive. Most phones charge wirelessly through cases up to about 3mm, but that is a general figure and not a promise — a rugged case, a wallet case, or one with a magnetic mount plate can easily exceed it.
If it charges without the case, you have your answer. Either use a thinner case, or one explicitly advertised as compatible with wireless charging, or take the case off when charging.
While the case is off, check for anything attached to the back of the phone: a pop socket, a card holder, a metal plate for a car mount. All of these block charging, and the metal ones can get noticeably hot, which is worth avoiding.
Find the alignment sweet spot
Coils are small and the tolerance is tighter than people expect, particularly on flat pads without magnets. Place the phone on the pad and move it slowly in small increments until the charging indicator appears, then leave it.
The phone’s coil is usually centred in the upper-middle of the back, though on some models it sits lower. If you can never find a position that works, try the phone in landscape orientation — on some pads this aligns better.
Magnetic chargers exist precisely to solve this problem, and if alignment is a recurring frustration a magnetic pad is a genuinely worthwhile upgrade.
Check the power adapter, not just the pad
This catches a lot of people. Wireless charging pads are usually sold without a power adapter, and the pad’s advertised wattage is what it can deliver only when fed enough power.
A 15W pad needs an adapter capable of at least 20W, and often one supporting a specific fast-charge protocol such as Power Delivery or Quick Charge. Plugged into an old 5W phone charger, or into a laptop USB port, the pad will either charge very slowly or refuse entirely.
Swap in a modern high-wattage adapter and test. Also swap the USB cable between adapter and pad — a cable rated only for data or low current is a common and invisible bottleneck.
Clean both surfaces
Dust, grit and metallic debris between the phone and the pad reduce coupling and can trigger the pad’s foreign-object detection, which shuts charging off as a safety measure.
Wipe both the back of the phone and the surface of the pad with a dry microfibre cloth. Check the pad’s surface for embedded grit, and look for anything metallic — a stray paperclip or a coin on the pad is exactly what foreign-object detection is designed to catch.
Restart the phone
Wireless charging is managed by software, and that software can hang. A restart clears it, and it is a thirty-second test.
If charging works after a restart but stops again later, note what you were doing when it stopped. Charging that fails after heavy use often means the phone got too warm and disabled wireless charging deliberately, which is normal protective behaviour rather than a fault.
Cross-test the phone and the pad separately
Try your phone on a different wireless charger, and try a different phone on your charger. This splits the problem definitively.
If your phone fails on every pad but charges fine with a cable, the phone’s wireless charging coil or its controller has failed, which is a repair rather than a settings problem. If other phones fail on your pad too, replace the pad.
Heat is the most common reason for charging that starts and then stops. Phones deliberately reduce or suspend wireless charging above a certain temperature to protect the battery. Direct sunlight, a warm room, or using the phone heavily while it charges will all trigger this. Move it somewhere cooler and it will resume.
Patterns worth recognising
Charges, then stops after a few minutes
Almost always thermal. Check whether the phone feels warm, move it out of sunlight, and stop using it while it charges. If it happens even in a cool room with the phone idle, the pad may be poorly ventilated — some enclosed pads trap their own heat.
Charges very slowly
Either the power adapter is under-specified, the alignment is marginal, or the case is absorbing energy. Check all three. Note also that wireless charging is inherently slower than cable charging, so some difference is expected and normal.
Clicks or buzzes while charging
Usually coil whine, which is harmless if quiet. If it is loud, or accompanied by the charging indicator flickering on and off, the phone is repeatedly starting and stopping — check alignment and for foreign objects.
Only works on one specific pad
Different pads implement the Qi standard with varying tolerance for alignment and case thickness. This is a compatibility quirk rather than a fault, and a magnetic charger usually resolves it.
Never leave a credit card, hotel key card, transit pass or passport between the phone and a wireless charger. The magnetic field can corrupt the magnetic stripe and interfere with RFID chips. Wallet cases are a particular risk — remove the cards before charging, or use a case that keeps them clear of the coil area.
Getting better results long term
If wireless charging matters to you, a magnetic charger removes the alignment problem entirely and is the single upgrade most worth making. Phones with built-in magnets snap into position; others can use a magnetic ring adhered to the case.
Feed the pad from a proper adapter — at least 20W with Power Delivery support — and use the cable that came with the pad rather than a random one from a drawer.
And be realistic about what wireless charging is for. It is convenient for topping up through the day, at a desk or a bedside. It is slower and warmer than a cable, and for getting from nearly empty to full quickly, a cable remains the better tool. Using both for their strengths is more sensible than expecting the pad to do everything.
Does wireless charging damage the battery?
Not inherently, but the heat it generates is a factor. Battery wear is driven by heat and by time spent at high charge levels, and wireless charging runs warmer than cable charging. Using a well-ventilated pad, keeping the phone out of direct sunlight, and enabling optimised charging features that pause at 80% overnight all reduce the impact. It is not something to avoid, just something not to combine with a hot environment.
Can I charge through any case?
Up to roughly 3mm of non-metallic material, usually yes. Thicker cases, rugged cases, wallet cases with cards, and anything containing metal will interfere. Cases advertised as wireless-charging compatible have been designed with the coil in mind, but a case with a metal mounting plate will block charging regardless of what the packaging says.
Why is wireless charging so much slower than my cable?
Because some of the energy becomes heat rather than charge, and because phones deliberately limit wireless charging power to manage temperature. A phone that takes 30 minutes to reach half charge on a cable might take twice that on a pad. This is expected behaviour rather than a fault.
What does the Qi certification actually mean?
Qi is the industry standard for wireless charging, and certification means a pad has been tested for interoperability and safety, including foreign-object detection that stops it heating metal objects. Uncertified pads may work but have not been through that testing. Given how little the certified ones cost, there is little reason to buy an uncertified pad.
My phone charges on the pad but the battery still goes down. Why?
The phone is drawing more power than the pad supplies. Heavy use — navigation, gaming, video calls — can easily exceed what wireless charging delivers, particularly through a case or with imperfect alignment. Use a cable for those situations.
The bottom line
Case off, alignment found, adequate power adapter. Those three checks resolve most wireless charging failures in under five minutes, and none of them cost anything. Cross-testing the phone and the pad separately settles the remaining cases definitively — and if alignment is a constant irritation, a magnetic charger is the fix worth paying for.
