Kastar 4-Pack Battery and AC Wall Charger Replacement for Olympus BLS-5, PS-BLS5, BLS-50 Battery, Olympus E-400, E-410, E-420, E-450, E-600, E-620, E-P1, E-P2, E-P3, E-PL1, E-PL1s, E-PL2, E-PL3 Camera - Walmart.com
Olympus E-420 Battery and Charger with Car Plug and EU Adapter - Replacement for Olympus BLS-1 Digital Camera Batteries and Chargers (1150mAh, 7.4V, Lithium-Ion) - Walmart.com
For Olympus BLS-1 BLS1 Camera Battery Evolt E-620 E-450 E-420 E-410 E-400 2 pack 804081322644 | eBay
File:Olympus E-620 with battery grip.jpg - Wikimedia Commons
Replacement battery for Olympus E-420 E420, LiIon, Li-Ion, 100% battery, Camcorder, Video, Digital Camera: Amazon.de: Electronics & Photo