The PS-BLN1/BLN-1 Lithium-Ion Battery Pack from Jupio is an equivalent battery to the Olympus PS-BLN1 and BLN-1 batteries, and it operates with the same cameras. It features an honest 1220mAh capacity, providing ample power for the camera when you need it the most. This battery is made with high-quality cells for long-lasting performance.
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Only luck and careful usage will get me through a simple shoot. The charge it holds is unlikely to be even half of what my old, continuously used EOM batteries still offer. Useful only as an emergency backup to keep in the bag with one caveat: even unused, if it's been in reserve for more than a few days, it needs to be recharged before going out with it So far, my experience with with 2nd-party batteries (not just Jupio and not just for Olympus cameras) has been consistently disappointing
Hesitated buying because no reviews were available. Took the plunge, bought 2 batteries (for use on the Oly M-1), very satisfied, unable to distinguish from the Olympus battery. Cannot comment about long term durability, have not used for more than 3 months.