The Makita BL4040F battery is technologically more advanced than the BL4040. It has high-performance cells with low internal resistance, which enable extremely high peak currents. Compared to a BL4040, the BL4040F can deliver up to 35% more continuous power. This can lead to a higher work output or runtime for powerful machines. The Makita BL4040F battery is designed so that it does not overheat even under very high loads and can therefore be charged immediately without a cooling phase in most applications.