OM SystemOlympus BLH-1 Rechargeable Battery, black

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Original a un excelente precio.

My previous Olympus cameras used BLN-1 batteries, and third-party options had always worked almost as good as the Olympus batteries, and getting two replacement batteries for less than half the price of one original is a bargain that was hard to pass up.But finding good BLH-1 batteries for my EM1-II has proven to be a challenge. I tried several different third party brands and none of them last even half as long as the originals, and one swelled up so badly that it could no longer fit in the camera. Not sure why that's the case with the BLH-1 clones, but after my third set of crappy replacements, I finally gave in an bought the Olympus brand.The good thing I can say about this battery is that it will give you the longest lasting and most stable performance for your EM1-II. The downside is the price and the charger that comes with it. Third-party chargers are way better since they offer options like multiple battery charging and/or the ability to be plugged directly into a socket instead of dealing with wires.

My photo shows the small battery from the EM5mk3 and you can see a big difference to the EM1mk2 battery.Really nice to get upto a 1000 shots from a camera compared to the measly 300+ from the smaller Ollies.No need to buy 3rd party batteries here as you wont need as many.

I conducted two tests with the Olympus BLH-1 and the Wasabi and Power2000 fully decoded clones. The first test was a controlled-lighting tripod-mount time lapse on an E-M1.2 at 1 minute intervals with the screen active. The second test was a constant current discharge to 7.2V at a rate which resulted in discharge time roughly matching the number of pictures taken in the first test. The 7.2V cut-off point was chosen as that appears to be when the E-M1.2 powers off - batteries consistently measured around 7.4V after shut-off, which at a 500mA current drops to around 7.2V.As is to be expected, the Olympus BLH-1 matched the best of the two clones that I tested in terms of capacity at around 1500mAh. The Wasabi 2 pack had one battery also measure around 1500mAh while the other was only around 1200mAh. Meanwhile both Power2000 batteries only measured around 800mAh.So why would I recommend the Olympus BLH-1 for most when the Wasabi 2 pack costs the same and provides anywhere from 80% to 100% the capacity? Well, the variability is one mark against the Wasabi - it's clear they're not using a single supplier/specification for their 18500 cells given the variance I observed. Second is that the circuitry within the battery isn't quite on par with the Olympus as there's no mechanism for charge-balancing between the two cells. Charge-balancing circuitry ensures that both cells are always fully charged by effectively charging each cell individually. The BLH-1 clones lack this circuitry and instead charge the two cells serially, which over many charge-discharge cycles invariably results in one cell having a higher state of charge than the other due to minute differences in charge rate between them. This results in a much faster reduction in usable battery capacity as the battery will stop charging soon as one cell is fully charged even if the other is only half charged, while on the discharge side the camera will turn off soon after one cell is mostly 'discharged'.