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Yeah, I can't remember what Amazon documentation mentioned that TTS will shorten the battery life but it does and they warn you.
But it does make sense, the reason most eInk devices last so long is they are not using any CPU power to drive the video and very little CPU power to power the device. When you are listening to TTS you are using CPU power to convert the text to audio. Personally I was amazed at how little TTS eat the battery. I listened to TTS for about 15hrs before I had to recharge my battery. Which is close to your statistic.
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