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.
1 The actual voltage of AAA, AA, C, and D (and 9 volt) batteries weakens as the batteries are drained of charge. 2  Different types of batteries start out with different maximum voltages. 3  NiMH batteries, in the sizes AAA, AA, C, and D, provide a maximum voltage of about 1.40 to 1.45 volts.