I have updated my iPhone 16 Pro max to iOS 24.2.4 update and after updating my phone, I plugged it in charging and after two hours, only 10% charging increased, it is charging very slow. Is it a bug and how can I solve this problem?
iPhone 16 Pro Max, iOS 26
At the time of writing, be aware that iOS 26.5 is now current. If you have not yet updated to this (the most recent) version of iOS you should do so. This important update includes bug fixes and essential security updates for your iPhone.
Some third-party USB-C power adapters (and portable PowerBanks) may not support USB PD (Power Delivery). Power Delivery mutually negotiates the charging voltage; the source, load and cable are all elements involved in the negotiation protocol. Unless the Power Adapter explicitly supports USB PD, it will almost certainly fail to properly charge your iPhone; proprietary charging standards, such as QC (Quick Charge), are not supported.
If you continue to experience difficulties when using an appropriate USB-C Power Adapter, you might be best advised to seek assistance directly from Apple Support. You can contact the Support Team using the Support link at top-right or bottom-left of this page. Alternatively, you can initiate and manage your support cases from Apple devices using the excellent Apple Support App. If not already installed, the App can be downloaded from the App Store:
https://apps.apple.com/app/apple-support/id1130498044
You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPhone, Power Adapter and cable(s):
At the time of writing, be aware that iOS 26.5 is now current. If you have not yet updated to this (the most recent) version of iOS you should do so. This important update includes bug fixes and essential security updates for your iPhone.
Some third-party USB-C power adapters (and portable PowerBanks) may not support USB PD (Power Delivery). Power Delivery mutually negotiates the charging voltage; the source, load and cable are all elements involved in the negotiation protocol. Unless the Power Adapter explicitly supports USB PD, it will almost certainly fail to properly charge your iPhone; proprietary charging standards, such as QC (Quick Charge), are not supported.
If you continue to experience difficulties when using an appropriate USB-C Power Adapter, you might be best advised to seek assistance directly from Apple Support. You can contact the Support Team using the Support link at top-right or bottom-left of this page. Alternatively, you can initiate and manage your support cases from Apple devices using the excellent Apple Support App. If not already installed, the App can be downloaded from the App Store:
https://apps.apple.com/app/apple-support/id1130498044
You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPhone, Power Adapter and cable(s):
Slow charging after update iOS 24.2.4
