It's the same advice for Ipods. Basically, charge at 50-40%, and then every so often let the battery drain completely. I got my 700 on Friday, and it was 1/2 charged, so I was able to explore it right out of the box. However, my holiday company wanted to go see "Australia", which is a long, but great movie, so, I put the reader on charge. I was lucky that my charger for my Casio EXILIM fit my 700, we travel, so it's cool to have one charger for two very diverse units. Since then I've read mostly with the light off, but I have read with the light on at night (lowest light works for me), and my battery hasn't gone down a tick yet. However, I have a sleep disorder, so the 700 seemed to be a godsend for me, so I'll probably keep my AC adapter bedside.
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