I have used the spare battery at the E-PL3. You are fit and processing is ok. Despite significantly higher specified nominal capacity of 1600mAh instead of 1150mAh of original batteries I could not tell the difference in the operating time. Ie. The camera is connected to the Canne just as fast at the end as with the Olympus Battery. At the much lower price, I find the performance but ok. Is to be seen, which has life of battery.