of all my tools, the 12v RA impact driver is the only one for which i have only 1 battery (came as part or a combo kit). the 12v batteries are marked down from $53 to $29. the 12v 2 spd drill (r820011) is also marked down from 119 to 79. i bought a battery and the drill. do i keep the battery only, so now i have 2 batts. for the 12v impact, or do i keep the 2sp drill leaving me with 3 12v batts, another cordless drill and my 7th battery charger? i have 2 14.4v impact drivers and 2 18v hammerdrills. any suggestions, short of keeping everything, would be appreciated.