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Question: Can the Oly OEM battery charge in the included charger
Document: I got these batteries and charger in  promptly. They are a perfect fit for my E-M5 and the HPD-6 grip. Only knock is that they state that they must be charged with the included charger. I realize that such is the case for most camera batteries, but it would have been nice if they were able to charge on the OEM Olympus charger.
You can't charge these in the charger that came with the camera and this charger doesn't charge the OEM battery quite full. That said it's a good cheap way to get some extra batteries. They seem to hold their charge pretty well and work well.
The two battery kit with charger is working well, been rotating the batteries with the one OEM that came with the camera reguarly and am not noticing a difference between them. This has been a great deal for me with the two batteries, charger with car adapter, and a functional USB adapter that works as a  card reader/thumb drive. Having the charger means that I can charge two batteries simultaneously.
I've been using these batteries with an Olympus O-MD E-M5 as a substitute for the hard to obtain Olympus BLN-1. These are of course MUCH cheaper. My performance observations:1) Voltage:- After a full charge using the supplied charger (Premium Tech), on a voltage-meter (no load) these batteries measured ~8.42v as compared to the ~8.64v for a fully charged Oly BLN-1 battery charged on the Oly BCN-1 charger.
I got my $ worth, but have knocked the score down a notch for the reliability issue. The problem battery began losing charge when not in use, while the good battery & the OEM battery both hold their charge well while not in use. Both "Power 2000"/"Premium Tech" batteries are stamped with the same mft date (04-June-2012)
I imagine the BLN-1 has overall greater capacity since it's starting at a higher nominal voltage at full charge (when charged on the Oly charger) & seems to drain at approximately the same rate.- in-use temperatures seem to be comparable (these & the Oly BLN-1 will both become warm during intensive usage.
I got the two battery kit because I would rather travel with two batteries and one charger than two batteries (one Oly, one 3rd party) and two chargers.
I bought this for my Olympus OM-D E-M5 camera as it looks to be a great deal compared to OEM. Long story short is: it is. The batteries run in the camera, their charger charges the OEM battery, the SD card reader works (great for 11" macbook air), screen protector looks decent although haven't put it on. The real deal here is the customer service.I tracked my package until it said it was delivered except it wasn't there when I got home.
The Premium Tech charger lists a nominal voltage output of 8.4v (at .7A) as compared to the Oly charger nominal output voltage of 8.7v (at .6A).
I've owned this power kit for a couple months now, and I can say the charger works great (with these batteries and Olympus brand), and the batteries seem to last just as long as the Olympus brand. I can't recommend the card reader that is included. The first time I used it my card failed, and -- as you might expect -- I haven't used it since. May not have been the reader, but I don't want to take any chances.
Answer: Yes, this charger does a good job charging the Olympus battery too.  This is the only charger I use now for the OM-D. I put the Olympus one away as it cannot charge these 3d party batteries.