It would be better for governments to provide tax credits / subsidies to battery manufacturing facilities than it would be to directly subsidize consumers. The hope being the cheaper battery component cost gets passed onto consumers.

Vehicle sales subsidies frankly just end up rolled into the price as a markup.

The Canadian government here partially has the right idea in only subsidizing vehicles under a 50k CAD ($36k USD) price tier -- unless they're manufactured in Canada. But I don't think that barrier is low enough. Should be $40k or even less. Our subsidy also takes the form of a direct cash subsidy instead of a tax credit -- which is regressive and helps people less in lower income tiers who don't pay much in income taxes.