{"id":3518,"date":"2026-10-29T13:38:34","date_gmt":"2026-10-29T05:38:34","guid":{"rendered":"http:\/\/www.junjunkirei.com\/blog\/?p=3518"},"modified":"2026-10-29T13:38:34","modified_gmt":"2026-10-29T05:38:34","slug":"how-to-test-if-a-wall-charger-is-working-4d03-a1fcaf","status":"publish","type":"post","link":"http:\/\/www.junjunkirei.com\/blog\/2026\/10\/29\/how-to-test-if-a-wall-charger-is-working-4d03-a1fcaf\/","title":{"rendered":"How to test if a wall charger is working?"},"content":{"rendered":"

Hey there! If you\u2019ve ever had your phone die mid-commute, tablet die right before a movie night, or wireless earbuds die when you need them most, you\u2019ve probably stared at your wall charger and thought, \u201cIs this thing even working? I swear it was fine yesterday.\u201d As a wall charger supplier, I field this question literally every single day from customers\u2014folks who bought a new phone, swapped chargers between devices, or just realized their old charger\u2019s been collecting dust and now won\u2019t power anything. Today, I\u2019m breaking down exactly how to test your wall charger (and keep those devices from dying on you at the worst possible time) without needing a lab full of fancy gear. No jargon, no overcomplicated steps\u2014just real, actionable stuff I tell my own customers. Wall Chargers<\/a><\/p>\n

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First off, let\u2019s get one tiny thing out of the way: this works for basically every charger you\u2019ve got. The old brick for your iPhone, the USB-C one for your laptop, the weird little cube that came with your wireless speaker\u2014we\u2019re talking every wall charger, so you don\u2019t have to hunt for a special test kit just to figure out if yours is trash. I\u2019ve seen people overcomplicate this so bad before\u2014they buy $50 charger testers from Amazon when all they need is a lamp and their own phone. Let\u2019s keep it simple, yeah?<\/p>\n

The first test I always recommend is the obvious one, but way more people skip it than you\u2019d think: swap it out with a known good charger. Wait, hold on\u2014don\u2019t just swap it for any<\/em> charger, swap it for one you already know works. Like, if your friend has the same phone model as you, borrow their charger. Or grab the charger that worked for your old phone that you know still powers your tablet. Here\u2019s the trick: take your \u201csuspect\u201d charger and plug it into your device. If it doesn\u2019t charge? Then take that known good<\/em> charger and plug it into the same device. If that<\/em> works? Your suspect charger is the bad one. But wait\u2014don\u2019t stop there. Sometimes it\u2019s not the charger, it\u2019s the cable. Oh right, I can\u2019t tell you how often that\u2019s the mix-up. If you swap chargers and still nothing, that\u2019s when you check the cable. Swap the USB-A or USB-C cable between two chargers. If the good charger with the suspect cable doesn\u2019t work, that\u2019s the cable. If the suspect charger with the good cable doesn\u2019t work? Yep, the charger is the issue. This is the first go-to because it takes 2 minutes, no extra stuff needed, and it catches 90% of the \u201ccharger not working\u201d problems right away.<\/p>\n

But what if you don\u2019t have a known good charger handy? Maybe you\u2019re traveling, or you just moved and left all your extra chargers at home. No problem\u2014next up, use a low-power test device that won\u2019t fry anything or cost you a new phone. My go-to here is a table lamp with a USB power adapter. Wait, hear me out\u2014most modern table lamps (like the ones with a built-in USB port for nightstands) run on super low current, usually 5W or 10W, which is exactly what most small chargers are rated for. Here\u2019s what you do: take your suspect wall charger, plug it into the wall, then plug the charger\u2019s cable into the table lamp\u2019s USB port. If the lamp turns on? Your charger is working. If not? That\u2019s a clear sign it\u2019s dead. I tested this last week with three old chargers in my garage\u2014one that was my kid\u2019s old phone charger, one that\u2019s a spare, and one that I thought was broken for my wireless earbuds. The spare lit up the lamp, the kid\u2019s old one lit it up dimly, and the earbud charger didn\u2019t do anything at all. That told me the earbud charger was trash, the kid\u2019s one was on its way out, and the spare was fine. Just a heads up though\u2014make sure the lamp isn\u2019t a fancy smart one that needs Wi-Fi or a specific app. Stick to a basic, plug-and-play lamp, no extra stuff required. It\u2019s way more reliable for this test.<\/p>\n

Another one I love is testing the charger with a power bank, but wait\u2014only certain power banks work for this. Pick a power bank that\u2019s charged up already. Plug your suspect charger into the wall, then plug your power bank into the charger. Wait 5 minutes, then unplug the power bank and check how much battery it has. If it went up at all? Your charger is working. If it stayed exactly the same? That\u2019s a problem. Why a power bank? Because it\u2019s a nice middle ground between a tiny lamp and a huge laptop charger. It can\u2019t really tell you if the charger is underpowered for high-demand stuff like laptops, but it works great for phones, earbuds, tablets\u2014all the stuff most people use wall chargers for. I\u2019ve had customers tell me their laptop charger \u201cworked\u201d because it charged their power bank, but it couldn\u2019t keep up with their laptop, which leads me to a quick side note: if you\u2019re testing a high-power charger (like for a laptop or a big tablet), this test might not catch if it\u2019s only underpowered for high-draw devices. But for everyday use? It\u2019s solid.<\/p>\n

Now, let\u2019s talk about the times when a charger feels<\/em> like it\u2019s working, but it\u2019s not. That\u2019s the sneaky stuff\u2014like when the LED light on the charger turns on, so you think it\u2019s fine, but it\u2019s actually only putting out half the power it\u2019s supposed to. I see this all the time with used chargers or chargers that\u2019ve been dropped. The LED might light up (that means there\u2019s some<\/em> power going through), but not enough to charge your phone, or it\u2019s giving it way too little power so it charges super slow. How do you test that? Well, if you\u2019ve got a way to check voltage, but most people don\u2019t have a multimeter lying around. Wait\u2014here\u2019s a cheap hack: time how long it takes your phone to charge from, say, 20% to 80% with your suspect charger, then do the same test with a known good charger of the same wattage. If the suspect one takes way longer? That\u2019s a red flag. For example, if your iPhone charges from 20% to 80% in 30 minutes with the good charger, and it takes an hour with the suspect one? That charger is underperforming, even if it\u2019s technically turning on. That\u2019s important because a charger that\u2019s underpowered can actually damage your battery over time, not just be a hassle. As a charger supplier, this is why we label all our chargers with exact wattage and output\u2014so you can match them to your device and avoid this exact problem.<\/p>\n

Wait, let\u2019s not forget the common mistakes people make that make their charger seem broken when it\u2019s not. Like, the wall outlet itself is dead. Oh my gosh, I can\u2019t tell you how many times a customer swears their charger is broken, and it turns out the outlet in their bedroom hasn\u2019t worked since they moved in, or the GFCI outlet in the bathroom tripped. That\u2019s such a simple step people skip! Always test the outlet first. How? Plug something else into it\u2014like your hair dryer, or that lamp we talked about earlier. If that doesn\u2019t work, hit the reset button on the outlet (if it\u2019s GFCI) or check the circuit breaker. That\u2019s always the first thing I tell anyone who calls me about a broken charger\u2014check the outlet first. 20% of the time, that\u2019s the whole problem. And another big one: loose connections. If the charger isn\u2019t plugged all the way into the wall, or the cable isn\u2019t pushed all the way into the charger or your device, it won\u2019t charge. A lot of people half-plug chargers when they\u2019re in a hurry, so that\u2019s a quick check too\u2014just make sure every connection is solid.<\/p>\n

What about chargers that\u2019ve been damaged physically? Like, the prongs on the wall plug are bent, or the cable is frayed, or the charger has been dropped a bunch. If any part of it looks cracked, frayed, or bent, that\u2019s a good sign it\u2019s not working right. I always tell customers: if your charger has exposed wires or a cracked casing, don\u2019t test it further\u2014throw it out. That\u2019s a safety hazard, not just a broken charger. I\u2019ve seen customers try to tape up frayed cables and keep using them, which is not only bad for their device, but can be a fire risk. So that\u2019s a quick visual test, too\u2014no fancy gear needed, just look at it.<\/p>\n

Now, let\u2019s get to the fun part: when you\u2019ve tested it and it is broken. What do you do? Well, if it\u2019s still under warranty, hit up the seller. But if it\u2019s an old charger, or out of warranty, that\u2019s where we come in. Wait, I should be transparent here\u2014like I said, I\u2019m a wall charger supplier, so I know a thing or two about what makes a good charger vs. a bad one. A lot of cheap chargers you get from gas stations or random online sellers are garbage, and they\u2019ll fail these tests way more often. Good chargers (like the ones we make) have built-in safety features, consistent power output, and don\u2019t die randomly after a few months. So if your test says your charger is dead, and you\u2019re tired of dealing with unreliable ones, it might be time to pick up a new one from a reputable supplier.<\/p>\n

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Wait, let\u2019s wrap up with a quick recap so you don\u2019t forget all this. Step 1: Swap with a known good charger + cable to rule out other issues. Step 2: Test the outlet itself\u2014plug something else in. Step 3: Use a basic table lamp to check if the charger outputs power at all. Step 4: For high-power or slow-charging issues, compare charge times to a good charger of the same wattage. Step 5: Do a visual check for damage\u2014frayed wires, bent prongs, cracked casings = time to replace.<\/p>\n

Charging Accessories<\/a> I\u2019ve been doing this long enough to know that chargers are one of those things everyone takes for granted until they don\u2019t work, and suddenly your whole day is ruined. Whether you\u2019re testing an old charger from the back of your junk drawer, a new one you just got in the mail, or a spare you keep in your car, these steps work every single time. If you go through these and still aren\u2019t sure if your charger is working, or you\u2019re in the market for a reliable, long-lasting wall charger that won\u2019t die on you mid-commute, feel free to reach out to us to chat about your needs\u2014we can help you pick the right one for your phone, laptop, tablet, whatever you\u2019ve got. No pressure, just honest advice from someone who\u2019s been in this game for years.<\/p>\n

References<\/h2>\n
    \n
  1. Federal Trade Commission. (2022). Avoiding Electrical Hazards: What to Know About Charging Devices.<\/li>\n
  2. International Electrotechnical Commission. (2021). Safety Requirements for External Power Supplies for Information Technology Equipment.<\/li>\n
  3. Consumer Reports. (2023). How to Test a Dead Phone Charger and Avoid Buying a Lemon.<\/li>\n
  4. Battery University. (2022). The Impact of Inconsistent Charger Output on Lithium-Ion Battery Lifespan.<\/li>\n<\/ol>\n
    \n

    Shenzhen Xierun Electronics Co., Ltd.<\/a>
    Shenzhen Xierun Electronics Co., Ltd. is one of the most professional wall chargers manufacturers and suppliers in China. With abundant experience, we warmly welcome you to wholesale the newest wall chargers made in China here from our factory. We also accept customized orders.
    Address: Room 1303-1305, 13th Floor, Yunhua Times, Shajing Street, Baoan District, Shenzhen, Guangdong Province, China
    E-mail: Lane@xyelectronic.com
    WebSite:     https:\/\/www.xierunelec.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey there! If you\u2019ve ever had your phone die mid-commute, tablet die right before a movie … How to test if a wall charger is working?<\/span>Read more<\/a><\/p>\n","protected":false},"author":30,"featured_media":3518,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3481],"class_list":["post-3518","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-wall-chargers-456f-a229b0"],"_links":{"self":[{"href":"http:\/\/www.junjunkirei.com\/blog\/wp-json\/wp\/v2\/posts\/3518","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.junjunkirei.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.junjunkirei.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.junjunkirei.com\/blog\/wp-json\/wp\/v2\/users\/30"}],"replies":[{"embeddable":true,"href":"http:\/\/www.junjunkirei.com\/blog\/wp-json\/wp\/v2\/comments?post=3518"}],"version-history":[{"count":0,"href":"http:\/\/www.junjunkirei.com\/blog\/wp-json\/wp\/v2\/posts\/3518\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.junjunkirei.com\/blog\/wp-json\/wp\/v2\/posts\/3518"}],"wp:attachment":[{"href":"http:\/\/www.junjunkirei.com\/blog\/wp-json\/wp\/v2\/media?parent=3518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.junjunkirei.com\/blog\/wp-json\/wp\/v2\/categories?post=3518"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.junjunkirei.com\/blog\/wp-json\/wp\/v2\/tags?post=3518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}