The increasingLithium-ion battery recycling demandDemand for batteriesBattery, particularly in the electric vehicleElectric Vehicles (EVs) industry, has led to a surge in the need for critical metalsCritical metals, including nickelNickel (Ni). It is projected that the demandDemand for Ni will exceed the existing primary supplySupply by 2029, with an estimated supplySupply shortage of 440,000 tonnes by 2031. This projected gap between supplySupply and demandDemand has promoted interest in Ni extractionNi extraction from resources that are technically challenging and not financially attractive today, including low-grade Ni laterite oreLaterite ore (< 1 wt.% Ni) and spent lithiumLithium-ion batteriesBattery (LIBsLithium Ion Batteries (LIB)). Currently, over half of the primary Ni supplySupply is commercially produced by processingProcessing Ni laterite oresLaterite ore through pyrometallurgical and hydrometallurgical routes for use in the stainless steel and batteryBattery markets. Most processed lateriteLaterites deposits have Ni content typically between 1.3 and 2.5 wt.%. However, ore grades are declining globally, requiring the Ni industry to look beyond conventional technologiesTechnology. Ni has extensive use in lithiumLithium nickelNickel manganese cobaltCobalt oxide and lithiumLithium nickelNickel cobaltCobalt aluminum oxide LIBsLithium Ion Batteries (LIB) with the cathode material consisting of LiNixCoyMn1−x−yO2 and LiNixCoyAl1−x−yO2, respectively. The projected ramp up in the number of end-of-life batteriesBattery by 2030 highlights the need to develop recyclingRecycling technologiesTechnology to address the environmentalEnvironmental impacts and alleviate supplySupply chain shortages. The synergy between the nickelNickel oxides in LIBsLithium Ion Batteries (LIB) and lateriteLaterites deposits presents an opportunity to accelerate their developmentDevelopment by learning from and combining advancements in each field. This paper reviews the existing processingProcessing routes developed for the extractionExtraction of Ni from low-grade laterite oreLaterite ore and spent LIBs. It highlights how these developmentsDevelopment are influenced by conventional lateriteLaterites processingProcessing technologiesTechnology. Additionally, this review provides insights into how battery recyclingBattery recycling can be integrated into existing Ni smelters/refineries and the techno-economic benefits of this integrationIntegration.