Once your Mac has learned your daily habits, it will wait before charging your device fully so that the cell spends less time at 100 percent. You’ll find this setting under System Preferences > Battery > Battery. Many companies have adopted such charging modes, including Apple. Batteries that are full store a higher voltage, which puts more stress on the cell.īattery University recommends that “a device should feature a ‘Long Life’ mode that keeps the battery at 4.05V/cell and offers a of about 80 percent” to prolong the life of the battery. Charging to 100 percent or letting your battery percentage drop too low is considered bad for the cell. The sweet spot for a lithium battery in terms of long-term health is between 80 percent and 40 percent. IPhones, iPads, and MacBooks can make use of a feature called Optimized Charging that monitors your usage pattern and adjusts charging behavior accordingly.
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