Elyse Betters Picaro / ZDNETI have spent a lot of time writing about how battery wear is a fact of life, and the more a battery is used, the more it will wear. It is a consumable item, and it will wear. Also: The best power banks you can buyBut there are also things that we can do to prevent battery wear. A research paper led by Jihyun Hong at POSTECH and Jongsoon Kim at Sungkyunkwan University on EV (electric vehicle) batteries uncovers a new enemy — too much discharge. Discharging EV batteries harms themWithout getting too deep into the chemistry and physics of battery wear, the study discusses a newly identified mechanism of oxygen loss in layered oxide cathodes used in lithium-ion batteries, specifically during the discharge process at voltages below 3.0V. Because of this additional wear, the study goes on to emphasize the importance of carefully setting DCOVs (discharge cut-off voltages) to slow down degradation and improve battery longevity. Also: 12 Android phone settings you should change to dramatically increase battery lifeBasically, excessively discharging batteries harms them. What about the batteries in our devices?While the study is limited to EV batteries, can we assume that this chemistry applies to the lithium-ion batteries found in smartphones, tablets, laptops, and so on? Also: iOS 18.4 update draining your iPhone’s battery? Try these 6 fixesYes and no. To strike a good balance between battery runtime and battery life, the typical point at which the battery management controller (a circuit that controls the charge and discharge of rechargeable batteries) sets the DCOV cut off is normally around 2.8 to 3.0V. So, there are batteries in all sorts of devices that dip below that 3.0V damaging discharge point mentioned in the study. But not all batteries will go that low, and I have found that higher-end devices and devices built to better handle temperature extremes have more conservative battery management and might cut off at 3.3V. Also: Change these 10 iOS settings right now to instantly get better iPhone battery lifeFor reference, iPhone batteries that I have tested appear to have DCOVs in the range of 3.1 to 3.3V and do not normally go below the 3.0V threshold, so they should not be subject to the damage highlighted by the study. More