Tech Desk 
Sep 03, 2024
Users most demanded feature on modern smartphone is reverse wireless charging. That way you can wirelessly charge other devices, such as earbuds cases or every other phone, if there’s no other power source available.
The Google Pixel 9 also has a version called Battery Share, but there’s one key difference compared to older Pixel models. The issue with reverse wireless charging is that all the power you share has to come out of your phone’s battery which is not said to be so ideal.
Older Pixels allowed you to mitigate this problem by letting you share power while your phone was plugged in to be charged which was ideal if you had a USB-C charger but were required to charge a device that didn’t support it. Like an iPhone, or a wearable. But that’s no longer possible with the Pixel 9.
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If you head to the Battery Share menu in the Pixel 9’s settings, you’ll able to view that turning the feature on is very simple. But as soon as you plug a charging cable into your phone the feature would automatically switch off — showcasing the message “Battery Share is unable during charging”.
Google hasn’t revealed the reason behind the change in the Pixel 9, but it’s possible that it could be down to long-term battery preservation. Wireless charging already generates a fair bit of excess heat.
Wired charging can also generate heat, especially at high speeds, and doubling up on heat generation isn’t very good for the phone — let alone the battery, which is already sensitive to extreme temperature changes.
