The BLH-1 Lithium-Ion Battery Pack from Watson is compatible with the same cameras that use the Olympus BLH-1 battery. It has a capacity of 1900mAh, 7.4V of output power, and 14.1Wh. Small and lightweight, lithium-ion batteries can be charged or discharged at any time without developing memory effect.
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Seems to take longer to charge and not getting as many shots as Olympus original batteries. Just a point or two behind Wasabi batteries from my experience but they'll do.
The battery seems to change appropriately, however it is a touch too tight a fit for the battery compartment to come out. I considered sending it back but instead took a file to shave off a bit of the plastic. That helped.