If you're eyeing an Android smartphone in the $700 to $900 range, then you're probably considering at least the Google Pixel 10 and OnePlus 15. If battery life is a metric you cannot compromise on, the OnePlus 15 is the easy recommendation. Google has a respectable 4,970 mAh battery in the Pixel 10, but it's unfortunately no match for the 7,300 mAh battery that powers the OnePlus 15. Though it is a bigger phone than the Pixel at 6.78 inches compared to 6.3 inches, the size difference isn't what allows the OnePlus 15 to have a much denser battery. Instead, that's down to its battery technology: The OnePlus 15 is one of the growing list of phones with silicon-carbon batteries, which allows manufacturers to pack more capacity into the same space than regular lithium-ion batteries.