battery draining faster than normal

I have an iPhone SE running the latest version of ios12. My battery seems to be draining more than normal. I'm not using the phone more than I usually do. It is also warmer than it usually is to the touch even when I'm not using it. I checked my battery health and it tells me my battery is supporting normal peak performance at 91 percent. I checked the percentage of apps and nothing unusual. I did a reset and restore and it still is warmer to the touch and battery percentage is dropping rather quickly. I'm thinking I may have updated an app that maybe taking a lot of background CPU than normal but can't put my finger on it. Any ideas?
Thanks.

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Faster battery drain just recently.

Hi Troy, Just within the past three days or so, I've noticed my phone's battery doesn't last as long as it has been. Usually I only needed to charge my phone every other day. But just recently, it's every evening. And I am not using my phone any more often. Any ideas why this is happening all of a sudden? Thanks.

Looks like it's probably time

Looks like it's probably time for a new battery. The SE devices are quite old so I would have the battery checked.