This is a new battery for your Viper, Clifford, Python 7752 series remote. SELLING BATTERY ONLY, super easy to remove and replace yourself.  If your remote RPN is 7752 then the battery will work.  Once you install the battery give it a minute for the remote to turn on, then fully charge with supplied charger. If it doesnt charge then clean the usb connector. Do not use phone chargers to charge your remote, you can damage the battery.  A computer is okay to use to charge the remote. Contact me for any info, as I have fixed alot of these remotes this way and should have an easy way to troubleshoot your remote.