i dnt kno if this already known but i jus came across it.
press DOWN (dont slide..."press") on the bump(the lil thing ment 2 slide cover off) rather than pushin up(sliding it)
then, put ur fingernail on the rim of the cameras lens(the batteries cover) and slide it up, while still pressing down on the bottom bump....
hope this helps
What?! the renoir's cover is the easiest bat. cover to be removed so far i have experienced (having and using different phones by motorola, nokia and sony erricson) and no offense, but what you said seems too complicated and i don't understand it well..
just push and hold the button on the top while the phone is facing down, then pull the cover up and "walla", done!! it's not a sliding cover...
