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My experience with Kobo Aura H2O is very good.
The charge lasts for more than three weeks, with an average reading of half an hour everyday. Whenever the battery reaches 30%, I connect the USB charger until 100%.
I keep the front light setting to 2% which is just sufficient to read in total darkness in the bedroom. The front light consumes more battery at high intensity. Try to set to the bare minimum for comfortable reading.
Sleep setting is 15 minutes. If you use the e-reader sparingly, you can set the device to shutdown at the maximum duration (1 hour). This will further saves battery power.
The only time the device consumes lots of battery is when I load the device with large number of books and the processing books takes long time. So I need to keep the USB charger connected until processing books database is complete.
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