An Apple patent uncovered on Thursday describes new technology Apple is experimenting with in an effort to increase the battery life in its device lines. The patent filing, entitled Increasing Energy Density in Rechargeable Lithium Battery Cells, describes a unique multi-pronged approach to the problem of poor battery life in consumer electronics. Apple is investigating the use of a new “multi-step constant-current constant-voltage (CC-CV) charging technique,” which would increase the volumetric and gravimetric energy density of energy-storing material within a battery. According to the filing, this would increase the capacity of a battery without impacting battery size or charge time. Relative to competitive products, Apple’s mobile device and laptop lines are often praised for exhibiting impressive battery life. There can never be enough time in between charges, however, and as more features and better displays are added to future devices, manufacturers will always struggle to ensure battery life is not overly degraded as a result.