Wasabi PowerUSB Battery (Ginger Series) for Olympus BLX-1 and Olympus OM System OM-1 / OM-1 Mark ii

So far so good ... quite a few months of use in my OM-1 and it's holding charge well, last as long when not being used, shoots the same (maybe slightly more??) number of frames as OEM battery, and fits smoothly in/out of body (no swelling). The camera seems to adequately report it's charge percent as it is used. I have used it in the cold (<20F) ... it struggles with that about like the OEM. I can't speak to how it handles heat - have not been anywhere >100F shooting with it, have not left it in a sealed car in sun in heat.I'm not a fan of reviews right off the bat, especially for something like a battery which could go bad in a few months. (I've had quite a few non-oem batteries do that!) My positive review here is not how it looks or feels ... it's based on numerous cycles in use :) I see no difference in performance vs the OEM battery so far.The USB-C charging directly on the battery is great - that >>IS<< an advantage I see this having over an OEM battery!! If OM systems was going to cheap out on giving us a charger, at least these guys found a better way! Right now I don't need additional batteries, but if I do, given performance so far + direct USB-C charging, I'll buy this over an OEM OM-Systems battery. AND it's far cheaper. To me this is a win-win-win with this battery.

works well -- charges fairly quickly and seem to last acceptable amout of time -- no need for a charger

This performs at least as good as the originals. I haven’t done extensive comparison so cannot validate that it last longer.-1 star because the level reporting in camera is not accurate. I left the camera at 80% charge one day and the next morning the camera showed 90%. It took a few shots in use for the camera to report 80% again.

I bought this as a back-up battery for my OM-1. I seldom exhaust a camera battery during a day's shooting, so didn't want to spend $100 for a second Olympus battery. I also appreciate the ability to charge the Wasabi battery by USB-C since I don't have a separate charger. Both batteries seem to have comparable performance and each lasts though a day of shooting. I've had Wasabi batteries for past cameras and never had any issues with them.