We have an answer. From the posting by FIRST FCOps in our General Forum >> Update after weekend#1: Batteries:

Battery Chargers - Teams can bring as many chargers as they want to the regionals; however, chargers must not exceed 4 amps. Furthermore, avoid using any rapid charge feature as you may destroy the battery.

Batteries - Teams as now allowed to bring extra batteries as long as they are only the 2001 or 2002 batteries. No other batteries will be allowed.