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An educated guess after reading some PDFs.
The battery and how it goes from it, to your device, is the issue. The current changes depending on what you're doing, what services are running in the background, etc.
If it gets hot, which is easily possible with a big book with lots of images and the like, it will blow up/leak with the pressure coming from the excess oxygen. It's like exposing a boiler with already extremely hot water, to 130 F of sun and heat.
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