Everything You Need to Know About 7.4V Battery
A 7.4V battery is typically made by connecting two 3.7V cells in series, resulting in a higher 7.4V output. 3. Energy Capacity. A 3.7V battery will generally have a lower energy capacity (measured in mAh or Wh) than a 7.4V battery of similar physical size. ... 7.4V battery packs are sometimes used in emergency lighting, backup power supplies ...