Amazon.com : Battery and Charger for Olympus Pen E-PL1, E-PL2, E-PL3 Digital Camera : Electronics
Olympus PEN E-PL5 Battery
Original Replacement Camera Battery PS BLS1 For Olympus E P1 E P2 E PL1 E P3 E PL3 E PM1 E 620 1150mAh Camera Battery|Mobile Phone Batteries| - AliExpress
Olympus E-PL1 PEN Camera Battery (OLPSBLS1)
Amazon.com: Kastar 2 Pack PS-BLS1 BLS-1 Battery for Olympus Evolt E-620 E-600 E-450 E-420 E-410 E-400 Pen E-PL1 E-P1 E-P2 E-P3 E-PL3 E-PM1 Digital Camera : Electronics