Found my battery drain - 5ghz wifi

I recently took a big hit in battery life. I could not understand what all of sudden caused my battery to drain so quickly. Looking at the battery function in the phone gave me no help. Then I realized I just enabled the 5ghz wifi on my AT&T router. I upgraded my laptop wifi card to get faster speeds and figured might as well get the 6P also on the 5ghz. Well 2 days later back on 2.4ghz band and my battery life is fine now.