RIM’s has called out Apple’s tablet, saying only that its upcoming PlayBook slate would have “equal or greater” battery life/endurance to Apple’s device.  Canadian company’s senior business marketing VP Jeff McDowell is saying this will also be achived using a smaller cell size.

The latter part isn’t hard to achieve, considering Apple filled most of its slate’s innards with Li-Pol juice packs, but the promise of matching its autonomy from the wall socket is a big claim to make. Many people consider that to be among the iPad’s foremost strengths, so RIM is surely aiming high by pledging to not only match it, but potentially better it. The PlayBook we saw in person wasn’t quite up to that level yet, but there’s still time until that March launch for RIM to turn bold words into a beautiful reality.