Electronics Myths That Keep Costing People Money

Contemporary lithium-ion batteries are managed by a charge controller chip that cuts off incoming current when the battery is full. Many devices also use software-based features — sometimes called "optimized charging" — that intentionally delay reaching 100% until just before you typically wake up. What does genuinely stress lithium-ion batteries is sustained high heat and consistently charging to full while the device runs hot. Overnight charging in a cool environment is far less damaging than, say, charging on a soft surface that traps heat.

A megapixel is simply one million pixels — it tells you how large an image can be printed or cropped, not how sharp, accurate, or detailed it looks under real-world conditions. A camera with a larger sensor capturing fewer megapixels can produce dramatically better low-light images than a smaller sensor with a higher count, because each individual pixel is physically larger and collects more light. Computational photography — the software algorithms that process each shot — now plays a major role in the final result, which is why two phones with similar specs can produce noticeably different images.

iOS and Android are designed to suspend background apps rather than run them continuously. A suspended app consumes negligible battery and memory. When you force-close it and then reopen it shortly after, the processor works harder to reload it from scratch than it would have to resume a suspended process. The one exception worth noting: apps that have location access or are actively syncing data in the background can consume meaningful power — but the fix there is adjusting each app's background permissions, not blanket force-closing everything.

Fast charging speed is determined by the charging protocol supported by both your device and your charger — not the cable's price tag. What matters in a cable is that it is rated for the wattage you intend to use and, ideally, carries a relevant safety certification (such as USB-IF certification for USB cables). A cable that meets those specifications but costs less will perform identically to a more expensive one for standard tasks. Cables do fail in predictable ways, but that's related to build quality at the connector and the cable jacket — not price alone. Our guide on why cables stop working explains what to actually look for.

RAM (Random Access Memory) is working memory — it holds data the device is actively using so it doesn't have to fetch it from slower storage. Having too little RAM for the tasks you run will absolutely slow a device down. But once a device has enough RAM for its workload, adding more produces little noticeable improvement in everyday use. A device with a faster processor and solid-state storage but modest RAM will often feel snappier than one with abundant RAM and a slower chip. For more on how processor specs translate to real-world performance, see our breakdown of processor cores and clock speed.