I can confirm the poor battery life (at least when using an SD card) on the 505 -- I thought it was just me!
Reading from an SD card (a SanDisk Ultra II 2 GB that Amazon recommended), I get less than 150 pages per bar: I went from three bars to one on a 2.5 hour plane trip (~150 pages) last night, and this morning, my reader is giving me the stop sign battery out warning. Back on to the PSP charger I guess.
The reader seems to drain very quickly even when "off" (suspended) and a book from the SD card is loaded in memory.
Would a sony memory stick give me better results? The performance with an SD card is just unacceptable.
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