The PQ182 contains a nickel-metal hydride battery that will take longer to reach optimum performance on a first charge (or without use for a long period of time). If your first 3 charges take longer than normal, it will optimize your shaver battery life. To ensure the best performance, charge the shaver only when the battery is low. The shaver takes about 10 hours to fully charge. Specific can go to the official website to find out.