Charging Cables, Wall Plugs, and Battery Health
The cable that came with your phone is fine. Don't lose it. When you do lose it — and you will — what you buy to replace it matters more than you might think.
The cheap-cable problem
The cables sold at gas stations, dollar stores, and unknown-brand listings on Amazon are not always cables. They are sometimes objects shaped like cables that do not contain enough copper to carry a real charge. The phone charges, but slowly. Or the phone displays "this accessory is not supported." Or — and I have seen this twice in my class — the cable damages the charging port.
The reason is the data and power negotiation inside a USB-C cable. A real cable has a small chip that tells the phone and the wall plug "I can carry 60 watts of power safely." A fake cable lies, and the wall plug pushes more power than the cable can handle. Heat builds up. Sometimes the cable just melts. Sometimes it takes the port with it.
You don't have to buy the manufacturer's own cable for $25. You do have to buy a cable from a brand whose reputation is at stake when one of their cables fails. Anker, Belkin, UGREEN, Spigen, Cable Matters — all reliable. Generally $10 to $18 for a six-foot cable.
The "USB-C to USB-C" question
All new iPhones, all new Pixels, and all new Galaxies use USB-C on both ends of the cable now. The same cable works for everyone, which is genuinely an improvement over the old days when each manufacturer had its own connector.
One catch: not all USB-C cables are equal. Some are "charge only" — they can carry power but not data, which means you can't use them to transfer files to a computer. Others are "USB 2" — they carry data but slowly. Others are "USB 3" — full speed.
For most home charging, "charge only" or "USB 2" is fine and cheaper. If you ever plan to plug the phone into a computer to back up large amounts of data, spring for the "USB 3" version. The packaging usually says.
The wall plug
The phone doesn't come with one anymore (covered in our box piece). You need to buy one.
The number to look for is "watts." A 5-watt plug — the old shape, the size of a half-inch cube — will charge your phone overnight but takes about three hours to do it. A 20-watt plug charges from empty to about 50 percent in 25 minutes. A 30-watt plug charges slightly faster than that, but you start hitting diminishing returns.
For most homes, the 20-watt plug is the right answer. About $19 from Apple, $15 from Anker or Belkin, $12 from UGREEN. All fine.
Avoid the unbranded $4 wall plugs at convenience stores. I mentioned in the box piece that one of these set fire to a kitchen counter. That happened to a class member's daughter-in-law. The plug had no UL safety certification, which is the small marking on the side of every legitimate electronic device sold in the US. Don't buy plugs without UL marking.
Wireless charging
If you have a phone made since 2018, it almost certainly supports wireless charging. You put the phone face-up on a small pad, and it charges without a cable.
Honest opinion: wireless charging is slower, slightly less efficient, and adds another piece of equipment to keep on your bedside table. If you find the cable annoying, the pad is a nice luxury. If you don't, save the money.
If you do buy one, make sure it's labeled "Qi" — the standard that works with both iPhone and Android. Pads that don't say Qi might be using a manufacturer-specific standard that won't work with your next phone.
Four habits that keep a battery healthy
This is the part of the article that actually matters in the long run. A phone battery degrades over time — it just does. The pace of degradation is faster or slower depending on how you treat it.
Don't routinely run it down to 0 percent. Lithium batteries hate being empty. They're happiest when they spend most of their life between 20 percent and 80 percent. Charging at 25 percent is better than waiting until 5 percent.
Don't keep it on the charger at 100 percent for days. Both phones now have an "Optimized Battery Charging" feature that learns your sleep schedule and stops charging at 80 percent until just before you usually wake up. Turn this on. iPhone: Settings → Battery → Battery Health & Charging → Optimized Battery Charging → on. Android: Settings → Battery → Adaptive Charging → on.
Don't let it get hot. Heat is the enemy of lithium batteries. Don't leave the phone on the dashboard of a car in summer. Don't charge it under a pillow. If the phone feels uncomfortably warm during gaming or a long video call, give it a break to cool down.
Don't use no-name fast chargers. The "fast" in fast charging is real — but the rate at which power gets pushed into the battery affects its long-term health. Apple, Google, and Samsung all design their fast-charging to balance speed against longevity. Off-brand fast chargers sometimes push more power than the battery can handle gracefully, which over years adds up.
How long the battery should last
A modern phone battery is rated to retain about 80 percent of its original capacity after roughly 800 to 1,000 charge cycles. In ordinary use, that translates to two and a half to four years before you notice meaningful degradation.
You can check your battery health on iPhone any time: Settings → Battery → Battery Health. The "Maximum Capacity" percentage is what to watch. Anything above 85 percent is fine. Below 80 percent and you're starting to notice. Below 70 percent and it's time to think about a battery replacement or a new phone.
Battery replacement costs around $99 for an iPhone at Apple or an authorized repair shop, and around $80 for most Pixel and Samsung models. Worth doing on a phone that's otherwise still working well — much cheaper than a new phone.
Android doesn't expose the exact battery health number as cleanly. The "AccuBattery" app from a developer named Digibites estimates it. Reasonable accuracy.
The two cables I actually own
One six-foot Anker USB-C-to-USB-C cable next to my bed. One three-foot Anker cable in my truck. One 20-watt UGREEN wall plug at home, one in my truck. I have not bought a cable from a gas station since 2018 and my battery has not let me down in that time. The whole kit cost about $50.
Most things in this category aren't worth fussing about. Cables are one of the few exceptions. Spend the extra $10. Save the kitchen counter.
Written by Robert Sandoval. Last verified 19 June 2026.