If you want to run the xhp70.2 off 12v, then you’ll need a driver that can handle 3s input, or run a 6v xhp70.2 on a buck driver. There aren’t many 1 mode drivers like that though, but you can get a programmable one that has a single mode group option.

The other option is you can find some appropriate current limiting resistors you can just run them direct drive off the 12v battery. a good place for drivers is Kaidomain.com, or Aliexpress.