modality - a method of therapy that involves physical or electrical therapeutic treatment. rehabilitation - the treatment of physical disabilities by massage and electrotherapy and exercises.
Alkaline AA batteries are rated 1.5 volts, while NiMH AA batteries are rated at 1.2 volts. NiMH generally refers to a battery being rechargeable and to the materials from which the battery is constructed.
AAA, AA, C, D batteries all are rated at 1.5 volts but besides the difference in physical size there is a big difference between them all. In an electrical circuit or device, there are two really important things:voltageandcurrent.