Just for clarity, and to make a few people very happy....
The 2010 pleo is the same as the Pleo RB. We now have 2 types of pleos: The Pleo "classic", which comes in the Ugobe model, and the Innvo Labs 2009 model. You then have Innvo Labs 2010 version of the pleo, call Pleo RB.
AND . . .
(drum roll please . . .)
According to tests and info received from Innvo labs, you should be able use the brown Pleo RB battery pack AND the white egg charger Li-Poly battery in your Pleo RB. In fact, the old green battery will fit into your Pleo RB, but it will run a bit slower and not for very long, but it will run! However, the brown Pleo RB battery WILL NOT fit into the classic pleo.
BUT!!!!! Be advised, Innvo Labs will not support or be held responsible for any damage from doing so . . . Even though they do admit both the brown and white batteries have exactly the same specs.