Usually yes. Most charging cases stop pulling significant power once full, but heat and worn-out charging gear are still worth avoiding overnight.
The worry about overnight charging comes from older battery myths about overcharging, but modern charging cases are built to handle this automatically.
What actually matters is the environment the case charges in, not how many hours it stays plugged in.
Wireless earbud cases use the same kind of lithium-ion charge management as phones: once the battery hits 100 percent, the case stops pulling significant power or switches to a trickle to maintain the charge, rather than continuing to force energy in. That's why leaving a case plugged in overnight doesn't overcharge it the way older battery myths suggest.
Heat is the main factor that ages small lithium-ion batteries faster, not the number of hours plugged in. A case sitting in a hot car, under a pillow, or in direct sunlight while charging is more likely to lose capacity over time than one charging overnight on a nightstand at room temperature.
Stop using the case and replace it if it swells, feels unusually hot to the touch, smells strange, or has a charging port that looks damaged or corroded. Any of those can signal a failing battery, which is a safety issue, not just a performance one.
Keep the case at room temperature while charging, use the cable it came with or a certified replacement, and don't worry about unplugging it the moment it hits 100 percent — the case is built to handle that on its own.
Leaving earbuds charging overnight is a normal habit, not a battery-killing mistake. Keep the case cool, use decent charging gear, and retire it if it ever swells or overheats.
It's uncommon under normal conditions, but a hot environment like a car or a spot near a heater raises the risk. Room-temperature overnight charging is generally low risk.
Not meaningfully once the case is full, since it stops pulling significant power. Consistent heat exposure is a bigger factor than the total hours plugged in.
A little warmth is normal, especially early in the charge. Unusually hot, swelling, or a strange smell means it's time to stop using the case and replace it.
Most hold up well for about two to three years of regular use before capacity noticeably declines, though heat exposure and charging habits can shorten or extend that.