Fuel cells are ultimately just fancy batteries, they could electrolyze their output water when they "recharge". But in practice, our cars are all lithium BEVs,

Fuel cells are ultimately just fancy batteries, they could electrolyze their output water when they "recharge". But in practice, our cars are all lithium BEVs, not FCEVs. There are some hydrogen forklifts, whose niche is that they're used 24/7 and hydrogen refills are faster than recharging batteries, but ultimately fuel cells make no sense at car-scale or below.