After looking on Amazon for some extra batteries for my EPM2, I came across these Sterlingtek BLS-1 batteries which were very highly rated: Amazon.com: STK's Olympus BLS-1 Battery - 1800mAh for Olympus PS-BLS1, BLS-1 Batteries and Olympus PEN E-PL1, E-PM1, EP3, EPL3, Evolt E-420, E-620, E-450, E-400, E-410 Digital SLR Cameras.: Camera & Photo Back when I used DSLRs, I also sometimes used Sterlingtek batteries and they were quite good. However, this particular Sterlingtek battery is a BLS-1 and the PM2 uses a BLS-5. From what I've read online, the two batteries and chargers (BCS-1 and BCS-5) seem to be interchangeable even though Olympus has a warning about it on their site. Has anyone had experience with these Sterlingtek BLS-1 batteries in cameras spec'd for a BLS-5? Any issues using BLS-1 and -5 interchangeably in the PM2 and its BCS-5 charger? Thanks!