Laptop repair for Lenovo (cmos)

I have a Lenovo L440 and the cmos battery is dead I’m new here but will be leaving Delhi soon In about 5 days. Currently I’m in juhu. Where can i contact to get stuff like this fixed asap for cheap. I went to the Lenovo store and they quoted 6k for the battery and 2.5k for the cmos… this is too much I recently bought the battery for 2k and it’s working… now just need a cmos battery Where can I go to get this fixed asap…. Close to my house and ofc a place that I can trust