We don't offer replacement keys at this time, but they are generically available Reention keys, made by Reention.There are a few 3rd party websites that offer replacement Reention keys for Reention battery systems. 

Here is one of the popular choices for ordering replacement keys, Select the option that says "Attack G1/G2" and enter your lock cylinder number in the order notes as shown below:

 Key Replacement

Lock cylinder number location is shown below: