"they don't reveal all the details of achieving good power consumption in their patents"

In general, that would mean the feature is not patented: the choice is usually between patent an invention (but it must be explicitly described), or keep it secret (but if anyone is able to copy it, they're allowed to do so).

Patents are essentially an award of a short-term monopoly, as recompense for publicly disclosing an invention. If the invention is not sufficiently explained, then it's merely a trade secret, and can be copied without challenge.