I have a cousin who is interested in trying out GrapheneOS on their old Pixel 7a that is in their drawer, but they are skeptical, given the insane amount of battery failures happening in the A series lineup, and they do not want to have the battery catch fire overnight. I know Google released some updates to prevent that by limiting battery capacity, but I was wondering if that made its way into GrapheneOS as well.
GrapheneOS has options to limit the charging capacity yes. It is better to ask questions on their own forum and you would have found the answer there: Charging optimization (80% charge limit) recalibration with Android 15 QPR2 - GrapheneOS Discussion Forum
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I think your cousin was talking about this
add SystemUI and Settings integration for detecting and notifying Pixel 6a users with batteries impacted by the fire hazard issue resulting in capacity and charging being throttled along with directing users to the support options for getting a free battery replacement, $150 credit or $100 cash as compensation for the faulty battery (a subset of this will be replaced by AOSP code when Android 16 QPR1 is finally pushed to AOSP)
which was added in this release. So yes it did get added to GrapheneOS
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