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Erich Zann · 04-14-2016, 10:07 AM

Battery life estimation.

First pictures of battery have been released :
http://img1.lesnumeriques.com/news/5...tterie-web.jpg

— 250 mAh for internal battery
— 1290 mAh for cover battery

Some estimations can be made based on previous Kindle models. It's only estimations: on one side the new Oasis have more LED and higher power consumption, but on the other side there are maybe software optimisations that can reduce the need for power.

I used wikipedia values for this.

• Kindle Paperwhite 1 & 2: 1470 mAh => 8 weeks reading <=> 56 days of reading <=> 28 hours of reading during 8 weeks => 52,5 mAh / reading hour

• Kindle Paperwhite 3 & Voyage: 1320 mAh => 6 weeks reading <=> 42 days of reading <=> 21 hours of reading during 8 weeks => 62,85 mAh / reading hour

Now I'm basing the following on the most favorable values (52,5 mAh/hour)

• Kindle Oasis without cover : 250 mAh. 250 mAh / 52,5 mAh = 4,76 hours of reading, or 9H½ days.

It's still approximative. During the 23H½ remaining hours of a day, the reader will also consume some power. As a consequence battery life expectancy measured in hours is much higher if you read several hours per day and not ½H as computed by manufacturers, because the battery will use most of its energy for reading than for standby position.
On my Kobo H2O I was able to read 10 novels of variable size during few days of vacations and intense reading sessions. It was more than 50H reading without any charge, which correspond to 50 × ½ = 100 days of reading, much more than what Kobo says.

In this context, a big reader will probably enjoy a higher battery life than 4,75 H of continuous reading without plugging the cover. But it's still very limited. I'm quite sure that the Oasis will be the very first eInk reader which can't last one complete day of reading… on a long and rainy reading day

(sorry for my english)

04-14-2016, 10:07 AM	#498
Erich Zann Member Posts: 24 Karma: 624956 Join Date: Jun 2015 Device: Kobo H2O, Nook Glowlight (2012), Sony PRS-505	Battery life estimation. First pictures of battery have been released : http://img1.lesnumeriques.com/news/5...tterie-web.jpg — 250 mAh for internal battery — 1290 mAh for cover battery Some estimations can be made based on previous Kindle models. It's only estimations: on one side the new Oasis have more LED and higher power consumption, but on the other side there are maybe software optimisations that can reduce the need for power. I used wikipedia values for this. • Kindle Paperwhite 1 & 2: 1470 mAh => 8 weeks reading <=> 56 days of reading <=> 28 hours of reading during 8 weeks => 52,5 mAh / reading hour • Kindle Paperwhite 3 & Voyage: 1320 mAh => 6 weeks reading <=> 42 days of reading <=> 21 hours of reading during 8 weeks => 62,85 mAh / reading hour Now I'm basing the following on the most favorable values (52,5 mAh/hour) • Kindle Oasis without cover : 250 mAh. 250 mAh / 52,5 mAh = 4,76 hours of reading, or 9H½ days. It's still approximative. During the 23H½ remaining hours of a day, the reader will also consume some power. As a consequence battery life expectancy measured in hours is much higher if you read several hours per day and not ½H as computed by manufacturers, because the battery will use most of its energy for reading than for standby position. On my Kobo H2O I was able to read 10 novels of variable size during few days of vacations and intense reading sessions. It was more than 50H reading without any charge, which correspond to 50 × ½ = 100 days of reading, much more than what Kobo says. In this context, a big reader will probably enjoy a higher battery life than 4,75 H of continuous reading without plugging the cover. But it's still very limited. I'm quite sure that the Oasis will be the very first eInk reader which can't last one complete day of reading… on a long and rainy reading day (sorry for my english)