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enuddleyarbl · 12-04-2021, 08:33 PM

I edited my OP to include my final battery life measurements:

"I fully drained the Sage's battery (until the unit shut down), recharged it and read for one hour at a time until it shut down again. I got a total of 8 hours and 12 minutes worth or reading time. Here's the breakdown of charge used for each hour:

Hour 1: 100% to 92% = 8% battery use
Hour 2: 92% to 79% = 13% battery use
Hour 3: 78% to 63% = 15% battery use
Hour 4: 62% to 46% = 16% battery use
Hour 5: 46% to 26% = 20% battery use
Hour 6: 25% to 18% = 7% battery use
Hour 7: 18% to 13% = 5% battery use
Hour 8: 13% to 1% = 12% battery use (and then 12 more minutes for that last percent of the battery to go and the Sage power itself down).

So, along with the battery life of the Sage being only about 2/3 of the Forma's, whatever algorithm they're using to determine the State of Charge of the battery needs work. The supposed battery use for any given hour of reading in the same text-based kepub should not vary from 5% to 20%.

Also, the Sage seems to charge faster than the Forma. But, the difference isn't anywhere near what it should be by using a USB 3 port vs a USB 2 port. My Forma charged from 0 to 94% in the first hour, 94% to 99% in the second hour, and then fully charged to 100% sometime thereafter. The Sage went from 0 to 99% in the first hour and then to the full 100% charge 50 minutes later."

I'm going to give dark mode a try now and see if that makes enough difference for me to actually keep it.

12-04-2021, 08:33 PM	#43
enuddleyarbl Guru Posts: 797 Karma: 1538394 Join Date: Sep 2013 Device: Kobo Sage	I edited my OP to include my final battery life measurements: "I fully drained the Sage's battery (until the unit shut down), recharged it and read for one hour at a time until it shut down again. I got a total of 8 hours and 12 minutes worth or reading time. Here's the breakdown of charge used for each hour: Hour 1: 100% to 92% = 8% battery use Hour 2: 92% to 79% = 13% battery use Hour 3: 78% to 63% = 15% battery use Hour 4: 62% to 46% = 16% battery use Hour 5: 46% to 26% = 20% battery use Hour 6: 25% to 18% = 7% battery use Hour 7: 18% to 13% = 5% battery use Hour 8: 13% to 1% = 12% battery use (and then 12 more minutes for that last percent of the battery to go and the Sage power itself down). So, along with the battery life of the Sage being only about 2/3 of the Forma's, whatever algorithm they're using to determine the State of Charge of the battery needs work. The supposed battery use for any given hour of reading in the same text-based kepub should not vary from 5% to 20%. Also, the Sage seems to charge faster than the Forma. But, the difference isn't anywhere near what it should be by using a USB 3 port vs a USB 2 port. My Forma charged from 0 to 94% in the first hour, 94% to 99% in the second hour, and then fully charged to 100% sometime thereafter. The Sage went from 0 to 99% in the first hour and then to the full 100% charge 50 minutes later." I'm going to give dark mode a try now and see if that makes enough difference for me to actually keep it.