@Captain Queeg Re:" Does adding an extra 4 hours battery life add anything?"
Very good point. The increase in battery life has to be on a scale (if one is going to make a marketing point of it) that it is actually noticed by the punter and perceived of as a genuine and useful increase. Otherwise the company concerned may risk a backlash from their customer base if the increase is in practice invisible to said customers. The practical reality is I suspect that there has to be something of a significant leap forward (as you outline) before the marketing department can start mouthing off raising the profile of the given device's battery life when designing their advertising campaign.
Biting the hand that feeds IT
