Camera draining battery 2 percent in a seconds

On my iphone 11 Everything else doesn’t drain as much battery I can use my phone consecutively and it would last 7 hours which is okay for 88 percent battery health, but as soon as I open camera from the app or intact any Other app like sc , my battery goes down like crazy. 2 percent in a second Is something wrong with my camera? Or my battery or is this related to the update. My Siri, Bluetooth etc everything else is off and even I tried the reset all setting but still facing this problem , kindly help …