Absolutely stunned at how good the batteries are performing. Charged 1st time and lasted over 4 weeks of shaving running at full pelt for at least 4 mins at a time, as if plugged into the mains. When they did run out of power they went down very fast, complete drop off. 2nd charge and running at full pelt again. One thing I would like to say is that the video on how to get into the Remington MS2-300 which the batteries were for, was absolutely essential, couldn't have done it without that video. However once the casing was opened I had to unclip the circuit board and lift it out a bit then unsolder the 2 wires that went to the motor as it was impossible to get to the battery terminals otherwise. Once the circuit board with the batteries was free from the casing I could get to the battery terminals. Once old batteries were removed and new put back in their place and the terminals soldered as per the video, the circuit board was roughly placed into place whilst I resoldered the 2 wires to their respective terminals on the motor. Then clipped circuit board back into place and reassembled as per video. All round, I'm very very pleased with the result.