Synergy Digital Power Tool Battery, Compatible with Panasonic EY9021B Power Tool, (Ni-MH, 2.4V, 1500mAh) Ultra High Capacity, Replacement for Panasonic EY9021 Battery - Walmart.com
Panasonic EY9021 Battery| 1500mAh Ni-MH Power Tool Battery – NextBatteries.com
2.4 volt Panasonic EY9021 battery by Powewarehouse - Professional Grade battery pack - Newegg.com