According to the OpenWrt WIki, the TP-Link MR3020 and TP-Link WR703N have nearly identical hardware specs, and the WR703N have been measured to draw a maximum of 185 mA (at boot) and an average of 100 mA with WiFi, giving an average power consumption of 0.5 W.
Using anvyl's calculation, that should give a battery life of 7 hours per 1000 mAh, but this doesn't fit with socaladam's experience with the SIIG 2400. The SIIG 2400 has a capacity of 2400 mAh, which should give nearly 17 hours of operation according to what we know so far. Where did the missing 10 hours go?
Toshiba informs us that the slowest USB drive listed on their page, draws 60 - 80 mA, and this paper tells the same story. Even though the USB specification says that the device should use a maximum of 2.5 mA when idle, the operating system keeps sending it a 2-byte keep alive signal, preventing the flash drive from entering low power mode, so they use nearly as much power when idle as when under load.
So if we assume. that an idle USB stick uses 80 mA, performing the calculation again gives us a battery life of a little over 9 hours with a 2400 mAh battery. And that's when both router and USB drive is just sitting there doing nothing...
- caretu
Using anvyl's calculation, that should give a battery life of 7 hours per 1000 mAh, but this doesn't fit with socaladam's experience with the SIIG 2400. The SIIG 2400 has a capacity of 2400 mAh, which should give nearly 17 hours of operation according to what we know so far. Where did the missing 10 hours go?
Toshiba informs us that the slowest USB drive listed on their page, draws 60 - 80 mA, and this paper tells the same story. Even though the USB specification says that the device should use a maximum of 2.5 mA when idle, the operating system keeps sending it a 2-byte keep alive signal, preventing the flash drive from entering low power mode, so they use nearly as much power when idle as when under load.
So if we assume. that an idle USB stick uses 80 mA, performing the calculation again gives us a battery life of a little over 9 hours with a 2400 mAh battery. And that's when both router and USB drive is just sitting there doing nothing...
- caretu