if, according to >>413795907, i don't need the extra battery
and, >>413797589, they come with the cables, but i still should get the charger

so i should instead get
https://rebuffreality.com/products/trackstrap-bundle-for-vive-trackers
and
https://www.amazon.com/gp/product/B00P936188/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=12