This reminds me of the crap Microsoft pulled against Netscape in the 1990s. Microsoft did everything in their power to sabotage Netscape, and as a result, were sued by the US government. Microsoft is using a slightly different tactic, but their end goal is the same: to kill their competitors in the browser market.
If Microsoft really cared about your battery life, they might consider giving their flagship OS a long-overdue de-bloating. The best way to save battery is often to reduce the amount of crap the CPU has to deal with. Of course, that’s not the Microsoft way.