MobileRead Forums - View Single Post - Touch I'm quite worried about the battery.

Paul_B · 06-08-2012, 02:07 PM

I sent one Nook ST back because I thought the battery was bad and I now don't think it was.
These are my observations of the Nook and Battery and charging.
(1) Charger the Battery (and read if you like while it is charging).
(2) when you are done charging (and reading if you are reading) and the battery is at 100% do NOT turn off the Nook inot Sleep Mode. My experience if that if you do you will get inaccurate battery discharge readings.
Instead Power off the Nook ST to Shutdown Completely and then you should get accurate discharge readings.
(3) Follow the above procedure EVERY TIME you do a recharge (shutting down and not just going into sleep mode).

Also - the Ads state the battery charge lasting for up to 2 months is reading for OLNY 1/2 hour a day.
Who in the heck reads for only 1/2 hour a day?
My experience is: Expect the battery to drain approximately 1% for every couple hours of reading time (if you follow the above charging procedure).

Once I charged to 100% and turned off to Sleep mode and came back later and the battery was at about 99% and while I was looking at the charge indicator it took a drop dow to 94% all of a sudden. That's when I stopped going to Sleep mode after a battery charge.

Here is a link on how to treat your battery.
http://batteryuniversity.com/learn/a...ased_batteries
Note the Chart: for the best battery life DO NOT read until the battery is Low and not even below 50% (if you want the battery to last for 1000+ charge cycles.
Recharge when it's down to 75% (25%DoD) or 50% (50%DoD).
Table 2: Cycle life as a function of depth of discharge
Depth of discharge____Discharge cycles
100% DoD___________300 to 500 cycles

50% DoD____________1,200 to 1,500 cycles

25% DoD____________2,000 to 2,500 cycles

10% DoD____________3,750 to 4,700 cycles

A partial discharge reduces stress and prolongs battery life. Elevated temperature and high currents also affect cycle life.

06-08-2012, 02:07 PM	#103
Paul_B Junior Member Posts: 2 Karma: 10 Join Date: Jun 2012 Device: Nookk ST	I sent one Nook ST back because I thought the battery was bad and I now don't think it was. These are my observations of the Nook and Battery and charging. (1) Charger the Battery (and read if you like while it is charging). (2) when you are done charging (and reading if you are reading) and the battery is at 100% do NOT turn off the Nook inot Sleep Mode. My experience if that if you do you will get inaccurate battery discharge readings. Instead Power off the Nook ST to Shutdown Completely and then you should get accurate discharge readings. (3) Follow the above procedure EVERY TIME you do a recharge (shutting down and not just going into sleep mode). Also - the Ads state the battery charge lasting for up to 2 months is reading for OLNY 1/2 hour a day. Who in the heck reads for only 1/2 hour a day? My experience is: Expect the battery to drain approximately 1% for every couple hours of reading time (if you follow the above charging procedure). Once I charged to 100% and turned off to Sleep mode and came back later and the battery was at about 99% and while I was looking at the charge indicator it took a drop dow to 94% all of a sudden. That's when I stopped going to Sleep mode after a battery charge. Here is a link on how to treat your battery. http://batteryuniversity.com/learn/a...ased_batteries Note the Chart: for the best battery life DO NOT read until the battery is Low and not even below 50% (if you want the battery to last for 1000+ charge cycles. Recharge when it's down to 75% (25%DoD) or 50% (50%DoD). Table 2: Cycle life as a function of depth of discharge Depth of discharge____Discharge cycles 100% DoD___________300 to 500 cycles 50% DoD____________1,200 to 1,500 cycles 25% DoD____________2,000 to 2,500 cycles 10% DoD____________3,750 to 4,700 cycles A partial discharge reduces stress and prolongs battery life. Elevated temperature and high currents also affect cycle life.