The official Olympus is about $60 on their website. B & H Photo sells it for $43 and they have another version for $29.95 by Pearstone. And then I found this one on Amazon "Maximal Power DB OLY BLS-1 Replacement Battery for Olympus Digital Camera/Camcorder" for about $10.00 and inquiring minds want to know which you'd buy? My point being do off brands matter? Not that I'd know that much about which brands of batteries were "off". My initial thoughts were to go with the Pearstone.