When a gadget refuses to charge or a smart device will not connect, the problem often comes down to a few basics: the cable, the power source, the network, or the battery. This guide walks you through the most common charging and connection troubleshooting steps, using official guidance from industry standards groups, platform documentation, and safety regulators. No special tools or deep technical knowledge are required, just a methodical approach.

Quick guide: Check your cable and charger first, then your network and hub, and always follow airline rules for batteries.

Charging problems: cables, chargers and power delivery

Many charging failures are caused by using cables or power adapters that do not support the power levels your device needs. The USB Implementers Forum (USB-IF) defines the USB Power Delivery (USB PD) specification, which allows a single USB Type-C cable to carry both data and flexible power up to 240 watts. According to the USB-IF, USB PD enables higher power for laptops, monitors, and other devices that previously required a separate power brick, and it lets each connected device negotiate only the power it requires.

For a charger and cable to deliver those higher power levels safely, they must be built to the correct USB PD revision and use a full-featured USB Type-C cable rated for the current. The USB-IF recommends that manufacturers submit products to its compliance program and use certified logos on packaging. When shopping for replacements, look for the certified USB logo and check that the product’s claimed wattage matches what your device expects. Our phone chargers and cables guide explains how to read those labels, and the charging cables section covers physical compatibility.

Apple’s support documentation adds a strong safety note. Apple states that its own USB power adapters are designed to meet government safety standards such as IEC/UL 60950-1 or IEC 62368-1, and that you can use third-party adapters that comply with applicable safety regulations. However, Apple warns that “other adapters might not meet applicable safety standards, and charging with such adapters could pose a risk of death or injury.” If an adapter or cable is damaged, replace it with one that carries a certification label from an independent testing lab.

When a device charges slowly or not at all, first check that the cable and power adapter support the USB PD profile your device requires. A cable that works for data may not be rated for high wattage. If the problem persists, try a different certified cable and adapter before assuming the device itself is faulty.

Smart device connection issues: Matter setup and network preparation

Smart home gadgets that refuse to pair or frequently drop offline often suffer from network configuration gaps rather than hardware defects. Google’s help resources for Matter, the industry smart home standard, outline a clear setup path that eliminates many common frustrations. According to Google’s “Prepare your smart home for Matter” guide, Matter-enabled devices work locally over your home wireless network instead of routing commands through the cloud, which improves speed and reliability.

Before adding any Matter device, you need a Matter-enabled hub that is already set up in the Google Home app. Google lists several of its own speakers, displays, and Wi-Fi routers that can act as a hub, some supporting only Wi-Fi and others also supporting Thread, a low-power mesh networking technology. If your Matter devices use Thread, you must have a hub that also functions as a Thread border router. The smart home hubs page and the Matter vs Zigbee vs Thread article explain these roles in more detail.

Google’s documentation stresses that IPv6 must be enabled on your home Wi-Fi router for Matter to work properly. Without IPv6, setup may appear to succeed but control and other functions will eventually fail. Check your router’s manual or contact your internet service provider to confirm IPv6 is active. Our smart home setup section has more on getting your network ready.

To add a Matter device, open the Google Home app, tap Add, and scan the QR code on the device or its packaging. If the setup freezes, Google advises restarting the Matter device, closing the app, clearing the app’s cache, and restarting your phone. If those steps do not help, a factory reset of the device, performed according to the manufacturer’s instructions, may be necessary. Google also notes that you can share a Matter device across multiple smart home platforms using the Multi-Admin feature, so family members can control the same lights or locks from their preferred app.

For non-Matter smart devices that still use Wi-Fi, similar principles apply: make sure the device is within range of your router, that your network is not overloaded, and that the device’s firmware is up to date. If a device keeps disconnecting, check the manufacturer’s support pages for its reset and re-pairing steps.

Battery safety and air travel rules

Lithium-ion and lithium-metal batteries power most portable gadgets, but they can overheat and enter a dangerous condition called thermal runaway if damaged, overcharged, exposed to water, or improperly packed. The U.S. Federal Aviation Administration (FAA) states that flight crews are trained to handle lithium battery fires, and passengers must notify the crew immediately if a battery or device is overheating, expanding, smoking, or burning.

For air travel, the FAA requires that spare (uninstalled) lithium batteries, including power banks and cell phone battery charging cases, be carried in carry-on baggage only. When a carry-on bag is checked at the gate, all spare batteries must be removed and kept with the passenger in the cabin. Battery terminals must be protected from short circuit by leaving batteries in retail packaging, covering terminals with tape, using a battery case, or placing them in a plastic bag. Lithium metal batteries are limited to 2 grams of lithium content per battery, and lithium ion batteries are limited to a rating of 100 watt hours (Wh) per battery. With airline approval, you may carry up to two larger spare lithium ion batteries (101 to 160 Wh). The FAA also notes that many airlines have stricter quantity limits, so you should check with your carrier before flying. Our power bank guide includes more detail on reading Wh ratings and choosing travel-friendly batteries.

Damaged or recalled batteries must not be carried aboard an aircraft unless the battery has been removed or otherwise made safe. If a battery is damaged or recalled, stop using the device and follow the manufacturer’s guidance or the CPSC recall notice. The gadget buying checklist can help you identify safety certifications before you purchase a replacement.

Frequently asked questions

Why won’t my phone charge even with a new cable?

First, verify that the cable and wall adapter both support the power level your phone expects. A cable that handles data may not be rated for fast charging. Try a different certified cable and adapter. If the phone still does not charge, the battery or charging circuit may need professional inspection.

How do I fix a smart device that won’t connect to my home network?

For Matter devices, confirm that IPv6 is enabled on your router and that you have a compatible hub set up in the Google Home app. Restart the device, clear the app’s cache, and attempt setup again. If the issue continues, perform a factory reset as described by the manufacturer. For older Wi-Fi devices, check signal strength and update the device firmware.

Can I bring a power bank on a plane?

Yes, but spare lithium batteries and power banks must go in your carry-on bag, not in checked luggage. Protect the terminals from short circuit, and make sure the battery’s rating does not exceed 100 watt hours unless you have airline approval for up to two larger batteries (101 to 160 Wh). Always confirm your airline’s specific rules before traveling.

For more step-by-step troubleshooting guides, visit our Gadget Troubleshooting section, or browse the broader Tech Buying Guides for compatibility and setup advice.

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