Amazon.com : 7.20V,900mAh,Li-ion,Replacement Digital Camera Battery for Olympus E-400, E-420, E-450, E-600, E-620, E-P1, E-P2, E-PL1, EVOLT E-410,Compatible Part Numbers:BLS-1, PS-BLS1,BLS-1, : Electronics
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
wrotniak.net: Olympus E-400 - description and commentary
Ansmann Olympus BLS-1 Digital Camera Battery from CameraWorld
Kastar Battery LCD AC Charger for Olympus BLS-5 & Olympus E-400 E400 Camera | eBay