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Originally Posted by cjp
But where did Karel come up with 8 hours when iRex said, and still says "days?"
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Karel says
here:
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In the current software version 1.0, we have only implemented very limited power management. While the iRex Digital Reader has a hardware architecture that is capable of utilizing a number of advanced power management functionalities including a suspend-to-RAM (standby mode) and suspend-to-Flash (hibernate mode). Once these are implemented the battery life will effectively be several days.
Although the following data is not 100% correct, it should give you a good view on what to expect of the battery life, so please do not pin me down on this data.
The iRex Digital Reader has a battery of 1300 mA (milliampere) and with software version 1.0 the reader consume about 150 mA per hour, resulting in about 8 hours of battery life. With suspend-to-RAM or standby mode, which we will introduce in a next software update, the reader will go into standby mode after x seconds. While in standby mode the power consumption will scale back to less than 50 mA. Good for about 24 hours of standby time.
In addition to the standby mode we will also be looking to introduce a sleep mode or suspend-to-Flash. This means that if the reader is not being used for x minutes it will go into sleep mode. While in sleep mode the power consumption is reduced to about 1 mA. To 'wake up' the reader from hibernate takes about 10 seconds.
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Suspend and sleep are useful additions, which (if implemented) will virtually eliminate the real problem with the iLiad that the boot time was a disincentive to turning the device off and to reading in short stretches. However, they don't effect battery life when actually using the device for reading. I think 10 hrs is the minimum reading time that a reading device should provide. Note that LCD-based dedicated readers provide 10-20 hr battery life, see
LCD E-Book Reader Matrix.