4 hours seems really short. Are you doing anything really intensive constantly for those 4 hours?
I recharge mine every night while I sleep, and I've never been below about 60%. I use it mostly for ebook reading, youtube, comics, and the occasional hour of gaming. I did one leave it uncharged for a few days, and it took 3 days of not-intensive use to run down, and I also left it looping a video after its first charge cycle to see how long it lasted, and it was down to 10% after 9.5 hours.
I have my screen brightness set almost to the lowest value - I only use it indoors and that's all that's needed for me.
I recharge mine every night while I sleep, and I've never been below about 60%. I use it mostly for ebook reading, youtube, comics, and the occasional hour of gaming. I did one leave it uncharged for a few days, and it took 3 days of not-intensive use to run down, and I also left it looping a video after its first charge cycle to see how long it lasted, and it was down to 10% after 9.5 hours.
I have my screen brightness set almost to the lowest value - I only use it indoors and that's all that's needed for me.