I guess that since the mass uptake of Smartphones and other portable WiFi-enabled devices, having a battery powered computer is less of a necessity than just a few years ago; I haven't replaced my dead notebook or netbook batteries for similar reasons.
If you wanted to score a high % hit rate against the spammers, the Edit time would need to be in the 3-5 minute range (as would Staff checks) - the search spiders are so efficient these days.