2x Pack - Olympus PS-BLS1 Battery + Charger - Replacement for Olympus BLS-1 Digital Camera Battery and Charger (1150mAh, 7.4V, Lithium-Ion) - Walmart.com
1800mAh PS BLS1, BLS 1 BLS1 Battery for Olympus E 400, E 410, E 420, E 450, E 600, E 620, PEN E P1, E P2, E P3, E PL1, E PL3|for olympus|olympus batterybattery olympus - AliExpress
Original Olympus PS-BLS1 Battery For Evolt E-400 E-410 E-420 E-450 E-620 E-P1 | eBay
Olympus OEM PS-BLS1 Battery For EP-1 Pen, Evolt E-410, E-420 and E-620 *EX* | eBay
Synergy Digital Camera Battery, Works with Olympus E450 Digital Camera, (li-ion, 7.4V, 1600 mAh) Ultra Hi-Capacity, Compatible with Olympus BLS-1 Battery - Walmart.com