The study aim was to assess the impact of Li-ion technology on the power tool field. Lithium-ion batteries were compared to nickel-based batteries, ascertaining their suitability for power tool applications. Li-ion was found to be best suited due to its increased capacity. Two observational studies were completed on outdoor sites exploring the benefits of the technology over mains-powered tools. The increased range of Li-ion tools improved the site experience for the user. All of the benefits recorded were knock-on effects of the increased battery capacity. Five interviews were then completed to determine the impact of the technology on the user. All users agreed the technology to be a landmark and that it has improved their efficiency on site. Finally, a case study was completed investigating how Li-ion has affected the market, and it was found that the technology has been used strategically;encouraging the user to buy from one manufacturer.