Hello AwsDhafer,
Based on what we are seeing here, the battery lost about 15% of its charge over a 5 hour time period. This would seem to be well within normal expectations, even with Low Power Mode enabled.
Some things to keep in mind after updating your iPhone is that it is not unusual for your battery life to be a little shorter for a couple days after updating. Your iPhone needs to download app data, sync contacts, index search results and in general complete the digital housekeeping required for a new iOS version. This can cause a bit of a drain that you don't typically see happening.
If your battery is still in good shape, there are some adjustments that can help improve the battery life.
First, you can adjust the display settings on your device. Take a look at the steps outlined here: Adjust the brightness and color temperature on your iPhone, iPad, or iPod touch - Apple Support
A Wi-Fi connection uses less battery power than a cellular network. When you’re using your device to access the internet, make sure that Wi-Fi is on if possible. Go to Settings > Wi-Fi and choose a Wi-Fi network.
If you’re using cellular, make sure to use the fastest available network. For example, a 4G network uses less battery than a 3G network. The faster your network connection is, the less time and energy it’ll take to access things on your device.
Another step you can take is to adjust your notifications. Notifications that show up on your lock screen will wake your device each time, which can affect battery life. To minimize the battery usage from notifications, go to Settings > Notifications.
You can also turn off Background App Refresh. Some apps frequently refresh or run in the background on your device. To minimize the effect on your battery life, turn off Background App Refresh. You can go to Settings > [App Name] > Background App Refresh.
You can also turn on low power mode. This reduces power consumption until you turn it off or charge your iPhone to 80%. When low power mode is on, certain settings and features like mail fetch, Hey Siri, Background App Refresh, and some visual effects are reduced or disabled. Go to Settings > Battery to enable Low Power Mode. Check out this article which explains Low Power Mode in more detail: Use Low Power Mode to save battery life on your iPhone - Apple Support
We also want you to be aware that as your iPhone battery ages, it’s not unusual for you to have to charge it more frequently. To learn more about what you can expect from your iPhone battery, check out this link: iPhone Battery and Performance - Apple Support
Have a good day.
