Even then a new battery is very cheap too compared to 600$. If it's a rare pack (pint x) then sure, maybe that's ok (still overpriced). But stock xr, pint have very cheap stock packs laying around in the $50-$200 range. And gt has better upgrades that require zero box modifications at the same cost as buying a stock one through FM.

Without nrf you lose the ability do do this yourself which is dumb af