Welch Allyn Battery Charger Module features a rechargeable nickel-cadmium battery included Smooth, nonabrasive knurled finish ensures a no-slip grip Chrome-plated brass construction for durability and reliable long-life Rechargeable and can also be converted for use with standard C-cell batteries (model 71000-C only) Recharges in the Welch Allyn desk charger and numerous stand consoles and well-chargers (model 71670)