you can try this shop https://www.takumiko.com.my/ . I changed my dell 15 inspiron battery from them. the price they quoted compare to official Dell is about 50% cheaper. Yes, they provide me OEM battery with 3 months warranty. The battery is still in good condition until now. It's been working/serving me for 2 years and still counting. My laptop is my daily driver. 8hrs a day, 6days a week. Battery still can run without charging for 5-6hrs of graphic editing usage.