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Jon, as a Sage owner, I would like to point out that I do not find the battery life to be rubbish. Yes, it is not as good as my other Kobo ereaders but it lasts me 2 to 3 days reading an average of 4 to 5 hours a day. Given that Kobo used to quote the battery life for reading 30 minutes per day, that number is pretty decent. About ⅔ of what I see on my Clara HD or Libra Colour—4 hours for 2 days is equivalent to 16 days using the reading 30 minutes per day with frontlight and WiFi off. Not all that bad for a 1,200mAH battery though I still wonder what some of Kobo's designers were smoking when they gave the power hungry CPU on the Sage the same battery as the Forma.
By comparison, one friend of mine has a Kindle Paperwhite Signature edition. This has a single core CPU and a 1700mAH battery. Amazon rates the battery life at 10 weeks with the usual reading 30 minutes per day (so 35 hours of reading), no WiFi. Real world testing says that after a few deep discharge/charge cycles you are see the equivalent to a 6 week battery life since most people read with the frontlight on and seldom remember to turn WiFi off.
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