I seldom connect to web with my kobo readers. Yes that drains battary faster but battery gage you will find is more eduicated guess than really accurate over short term. After I end wifi connection and sync sometimes indicated battery level goes back up a little. I have used Kobo touch to post emails and check some websites, while I had charger connected. This worked better if the website had tablet/phone version. A little slow but ok way to waste time and I had nothing better to do then anyway. Only really big advantage to using tablet was bluetooth keyboaded and color screen.
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