CR2016 Keyless Entry Remote battery . Please note that most Dodge, Jeep, Chrysler, Mercury, Ford and Lincoln remotes using this type of a battery require 2 batteries per remote . Please make sure this is the right battery for your remote. You can simply open the remote to see the type of a battery you need. All of our remotes come with battery. There is no need to buy one for the remote you purchase from us. It is recommended to change the battery in your remote every 6-12 months or so.