@Motoproponent said in CHALLENGE = Match or Exceed Your Birthday Years In Miles On Your Birthday (or close to your birthday)!: @blkwalnutgrwr I have a 4209 vamped with Sonny's kit. I run the battery from my eBike (14 amp hours) in my backpack through a solar controller to step up the voltage. I get an extra 40ish miles on top the stock range. Thanks Moto, that's good to know, glad I bought my xr when I did. I may start with the carvepower for charging on a break and avoid tapping the wires, less extra stuff on the board the better.