A charge cycle is the process of charging a rechargeable battery and discharging it as required into a load. In general, number of cycles for a rechargeable battery indicates how many times it can undergo the process of complete charging and discharging until failure or it starting to lose capacity.

Discharging or charging is always occurring inside a battery at any given time. This causes the battery to discharge or produce electrical energy. This excess electron flow out of the negative side of the battery, through the electrical device, and back to the positive side of the battery is what creates DC current.

Discharging, or draining, describes the process of your battery loosing voltage, or energy. It is important to understand that a battery is always discharging anytime it is not being directly charged.

, Android user since 2010. Most Lithium-ion batteries are only rated for 400–500 complete charge cycles (1–1.5 years). Beyond that point, the battery capacity will drop below 80% and it may take more time to charge as the battery chemistry changes.

Most current Macs (MacBooks, MacBook Airs, and MacBook Pros) use batteries assessed as having 1,000 battery cycles. That’s pretty much good enough for at least three years of regular use. Older Macs (including the original MacBook Air) carried batteries with just 300 cycles inside.

The life of batteries like the one in your computer is 400 to 500 charge cycles. The “up to 300” is based on Apple’s recommendation that a properly maintained notebook battery should last at least 300 cycles.

A phone battery is typically designed to last around 500 to 600 cycles, and a cycle is defined as charging a completely dead battery to 100% then draining it to zero again.

Charging My iPhone Overnight Will Overload the Battery: FALSE. Once the internal lithium-ion battery hits 100% of its capacity, charging stops. If you leave the smartphone plugged in overnight, it is going to use a bit of energy constantly trickling new juice to the battery every time it falls to 99%.

A: Yes, slow charging is better than fast charging, for battery health. Slower charging actually is better because there is less internal heat build-up. Temperature extremes, whether hot or cold, are never good for a battery.

Why would you want to disable fast charging in the first place? Still, fast charging your device all the time isn’t beneficial in the long run. First off, the Lithium-Ion (Li-Ion) battery inside your phone will degrade faster if you’re always supercharging it.

Fast charging pushes a lot of juice in a short amount of time (hence the name), so devices can easily overheat. Some people hear this slight “whir” and find it annoying, and disabling fast wireless charging prevents this from happening.

But phones can get rather hot with fast charging, and heated batteries are bound to see their longevity reduce over a long period of time. Furthermore, it’s not always comfortable to use smartphones when they are hot to the touch, which is one reason you might want to turn off fast charge.

Broken USB cable. Lint / Dirt accumulation inside the micro-USB port (charging port) Faulty charging port. Fast charging is disabled from Settings.