The battery is total of good and absolutely compatible with the original. Regarding the performance of the original batteries BLS-5, however, does not reach to the Blumax replacement battery OLY BLS5 1200 mAh. After several battery charges I would appreciate good 50-80 fewer photos than with the original Olympus battery.
Nevertheless, a good backup and the price to worlds cheaper than the original battery. I'd rather the two Blumax BLS-5 buy spare battery for OLY BLS5 1200 mAh and remain cheaper than an original battery.