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I worked on a mobile FPS that was able to run at full-rez, 60fps on an iPad3. Unfortunately, doing so drained the battery faster than the wall charger could refill it! So, we shipped locked at 30fps and provided a "battery hog mode" option to the user.

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What level was the battery at? Past 80% most Lithium Ion or Lithium Polymer battery controllers will change to a trickle charge which could explain it.

You could drain the battery completely while charging.

Ingress will do this on a Nexus 5 - except for wall chargers that are delivering the full ~1.7A (which are very very very few)

Ingress can do this on a Galaxy Nexus with a 2A external battery pack (or, ya know, car). I was only able to help with about 1/2 of an Interitus event cause my phone kept dying and I'd have to wait a bit to bring it back online.

I hate my phone.

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