Battery

If you are experiencing unusually rapid battery drain and overheating issues with your iPhone 13, despite having a battery health of 99%, there are a few potential factors to consider:

1. Software-related issues: Sometimes, certain apps or software processes can consume excessive power or cause your device to overheat. Ensure that your iPhone’s operating system and all apps are up to date. You can also try closing background apps, restarting your device, or performing a soft reset to see if it resolves the problem.

2. Settings and usage patterns: Certain settings like screen brightness, push email, background app refresh, and location services can impact battery life. Consider adjusting these settings and monitoring your usage patterns to see if it improves battery performance.

3. Faulty battery or hardware: Although your battery health is reported as 99%, there is still a possibility of a faulty battery or hardware issue. If the problem persists, it may be worth contacting Apple Support or visiting an authorized service center to have your device examined.

vanz10 Said:

"Battery: I bought my iPhone a few months ago and my battery has started draining way quicker than usual. My battery health is 99% but still it drains real quick and overheats."

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Troubleshooting an Overheating Phone:

Clear Space, as System Resources may be Swollen Up:

Troubleshooting iPhone Storage:

Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support

So, what to do...

Clear Space Using my User Tips:

• How to Clear Space from your Mobile Device, and What to Clear: - User Tip. You may have too much installed, and need to clear space. So, see my user tip: 
• How to Clear "Other" in your iPhone's Storage - Use Backup - User Tip. Caches would be being used for remembrance of application use. It is essentially the same for an iPhone. You'd backup your iPhone, and then restore your iPhone from the backup you've just created. All System Data will delete.