I can see on my NE2700 the battery status icon.
Once fully charged it shows two portions full.
Than I suppose when i see only one portion, that means 50 % of energy left.
Than the portions dissapear and I see only the battery icon lines (empty so) blinking.
That means so it left me how many times to use it once it blinks (something like 10% or less) ?
Other question, if instead of empty battery blinking I would start the copy process, than it will stop I suppose as the battery will discharge completely, but is there some risk for my data on my CF card, once the transfer is interrupted by the power shut down ?