I bought two of these batteries for my RAZR V3. They work. The seem to hold a charge about as long as my old stock battery, which I estimate to be a couple years old, so I doubt they are truly OEM. I use a separate charger to charge my batteries and just swap batteries once one is almost dead, and I fully cycle the batteries between most uses (using repeating video before battery swapping until the phone powers down). I haven't done any true data analysis with them to provide you with better info. I would buy them again. You get what you pay for, and I doubt these last as long as a new, truly OEM battery. I'm happy with using two of these batteries that combine for about 150% the life of the OEM for a total cost which is much less than that of one new OEM battery.