DOD is an abbreviation for "Depth of Discharge," which indicates the percentage of battery capacity that has been discharged, typically represented as a percentage. For example, a battery with a DOD of 50% means that half of its rated capacity has been discharged. In the usage of lithium batteries, controlling DOD is crucial. Deep discharge often accelerates the deterioration of lithium battery lifespan. Therefore, maintaining DOD at lower levels can prolong the lifespan of lithium batteries. It is generally recommended to keep DOD below 80% to ensure the long-term health and performance of the battery.