I purchased my X100 from Amazon Warehouse. Camera was new (opened box), but shipped without a battery. Picked up three of these and haven't looked back. They hold their charge for the roughly 300 shots that the OEM batteries are reported to be good for. Three of them lasted me on a five day camping trip with about 500 frames and A LOT of time forgetting to turn the camera off in between shots. I also usually shoot in OVF, which drains more battery than EVF (go figure). Though I cannot compare them to the OEM battery because I do not own one, for my needs these batteries work fine, and at a fraction of the price I would rather spend $50 on 5 MaxPower batteries than on one OEM battery.