Most of the car keys gives problem when their battery gets weak. You can easily replace the battery for most of the cars by watching corresponding videos:
* [https://www.youtube.com/watch?v=VeSvPwOA3JA|BMW]
* [https://www.youtube.com/watch?v=7Pc1kW04-Mc|Hyundai Smart Keys]
* [https://www.youtube.com/watch?v=O8CZXtS_eHc|Audi]
* [https://www.youtube.com/watch?v=6LYZL69EmEM|Nissan Smart Key]
* [https://www.youtube.com/watch?v=v_s5Ga6desA|Toyota]
* [https://www.youtube.com/watch?v=TBA_4Z_7hMk|Suzuki]
* [https://www.youtube.com/watch?v=aoOUT4_OckE|Chevrolet]
etc.