Apple has filed a patent for a technology meant to increase the lifespan of its battery and cell density, offering a graduated charging system. In principle, a battery is recharged rapidly at first by increasing the voltage over the hours, but maintaining a constant current (left diagram). It ends with a constant voltage and current decreases.
Pat talks about Apple charging graduated. Instead of having a constant current and a decrease at the end of charging, the current starts at a higher level (chart at right), but falls gradually about every half hour. The principle is simple. The current used is determined by the level of battery charge.
The idea is not new, but Apple wants to push the concept much further with much more precise adjustments. Profits would increase the lifespan of the battery that loses less of its capacity after 300 charge-discharge cycles (lower curves). This method would also increase the surface of the anode of the battery, thereby increasing its density without having to enlarge the cell. 
Pat talks about Apple charging graduated. Instead of having a constant current and a decrease at the end of charging, the current starts at a higher level (chart at right), but falls gradually about every half hour. The principle is simple. The current used is determined by the level of battery charge.
The idea is not new, but Apple wants to push the concept much further with much more precise adjustments. Profits would increase the lifespan of the battery that loses less of its capacity after 300 charge-discharge cycles (lower curves). This method would also increase the surface of the anode of the battery, thereby increasing its density without having to enlarge the cell.
- Apple patent application points to denser batteries, improved charging technique (20/02/2011)
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- Apple looking to increase mobile battery life with CC-CV tech (18/02/2011)
- Do I need specific rechargeable batteries for the Magic Mouse? (27/01/2011)
- Apple appears to be working on longer life batteries (17/02/2011)
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