Wasabi Power Battery (2-Pack) and Dual Charger for Olympus BLH-1 (Fully Decoded) and Olympus OM-D E-M1 Mark II, OM-D E-M1 Mark III, OM-D E-M1X

I have purchased a number of after market batteries and chargers for my digital cameras including several from Wasabi. After a bit over a year, one of the charging slots on my charger stopped working. When I contacted them their tech support was in California. I was pleased to learn they offer a 3 year warranty. After I explained the problem, they promptly sent me a replacement. This is in distinction to another company where the only contact information is in Shenzhen China and I never received a response to my email. I wouldn't hesitate to buy from them again

as told. Seems to work well

This is great buy as I take with me when I am camping. Easy to charge and the batteries last the same as om batteries. I am an Olympus user. I did have one battery swell a little after 3 years of use which was weird but the price I paid for the battery not a big deal. I just wish had type C connection since that is the standard nowadays.

This is a 'killer deal'. I have previously purchased this brand and model. The specs are conservative; I get great life and consistent performance from them in my camera. Throwing in the dual charger makes this a great value!

I use Wasabi power cells/batteries in 2 camera systems- different camera bodies. These replace or backup OEM batteries when I travel or am out blasting away. I’ve been using them for several years and ne’er had problems with their performance. Yes, they do not always have same capability as the OEM types, but they rotate in service okay and are relatively inexpensive. They recharge consistently and reasonably fast.

I got exactly what I wanted and it came quickly.

When I purchase my EM-1 Mk2 (new) I bought two spare Wasabi's BLM-1s. They and the OEM battery are working just fine. Therefore when I recently purchased an EM-1 Mk3 (used) I bought another 2 Wasabi BLM1s . Every indication I'm getting so far is that these new batteries will be just as reliable as my original purchase.

I conducted two tests with an original 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.Despite the Wasabi batteries coming in close to the original BLH-1 in terms of capacity I would not recommend them as a direct replacement. First issue is the disparity in capacity between the two batteries I received. I ended up carefully disassembling the lower capacity battery and measured both cells individually to confirm that they each had 1200mAh usable capacity. This implies that different 18500 cells were used in one battery I received versus the other. Now it could be that all of the cells Wasabi sources are in the 1200-1500mAh usable capacity range, or they could use lower capacity cells as well. There's no way to tell, but having different capacity between two batteries in a 2 pack does not bode well.The second reason why I would not recommend these batteries as a direct replacement is that they lack charge balancing circuitry. These batteries make use of 2 individual lithium ion cells in series to produce the 7.4V nominal output. The original BLH-1 has circuitry which activates when in an OEM charger to charge each of those two cells individually, thus ensuring that they both fully charge. The Wasabi circuitry provides basic over and under voltage protections in addition to the batter status information output to the camera, but it does not have any charge balancing circuitry. The result of such will be a gradual decrease in effective capacity. Small differences between the two cells will cause one to have a higher charge level than the other during the course of discharge - say it ends at 10% while the other is at 9%. When recharged in series without charge balancing circuitry some portion of that difference in charge level will remain - say 100% charged for one cell and 99.5% for the other. This is a compounding issue, so after the next charge cycle it would be 100% and 99% and so on. Key takeaway being that every charge cycle will result in less effective capacity than the last.Now all that said, if you know what you're doing these are great batteries... to carefully disassemble and turn into 18500 cell holders for your Olympus camera. I carefully cut the non-contact end off one of the batteries, removed the cells, slightly modified the circuit board, and added some spring contacts on the end I'd removed. The result being that I can now swap 18500 cells into my camera almost as easily as a battery. This method avoids the recharging shortcoming of the circuitry by avoiding it altogether - I recharge the 18500 cells individually in a normal charger. To be clear, I'm not recommending that this be done, just providing the information that it can be done. (As an electrical engineer familiar with lithium ion cells I was still somewhat wary of disassembling and modifying the circuit board - only did so after fully mapping it out.)