A portable power source is essential for transcutaneous electrical nerve stimulation (TENS) devices, enabling their use away from mains electricity. These power sources typically take the form of standard or rechargeable batteries, varying in size and type depending on the specific TENS unit model. For example, some units might use readily available AA or AAA batteries, while others might have custom rechargeable battery packs.
The availability of a reliable power supply allows users to benefit from pain relief on the go, during travel, or in situations where access to an electrical outlet is limited. This portability contributes significantly to the therapeutic value of TENS therapy, offering flexibility and convenience. Historically, early TENS devices were bulky and relied on AC power, restricting their use. The development of smaller, battery-powered units marked a significant advancement, expanding access to this pain management modality.
