RF30 FM/AM/SW Shortwave Radio1000mAh Rechargeable Battery RF30 has a 3. 7V, 1000mAh rechargeable battery, which means a long last battery life. Charge 3 4 hours could last a couple of months. Easy to Use There is no complicated design on RF30, so this AM FM SW radio is easy to operate for both elders and kids. With big buttons, you could search radio stations both manually and automatically. A strong chip makes RF30 a big storage capacity, which could save up to 440 stations.