This review for the e410 has stats for e510 battery life - 650 shots. Seems like that's quite enough without needing a spare battery unless you're like kalyan and going out for months into a dense forest ..
http://www.dcresource.com/reviews/olympus/e410-review/index.shtml Rishab Aiyer Ghosh wrote: > for the cameraheads on silk - > i just got an olympus e-510 as an early birthday gift... i'm wondering > if i should get an extra battery and, mainly, if it's a good idea to get > the olympus battery than one of the many knock-off brands (digipower, > american power, etc) that claim to provide the same battery at 50% or > less the price.
