Makita 1910N6-8 Bl4040F Xgt 40Vmax Battery 40V 4.0Ah Li-Ion

The BL4040F uses cells with lower internal resistance. As a result, this battery can deliver high peak power (close to that of the BL4050F), will heat up less and autonomy is also better as energy loss during discharge is lower. This battery is particularly suitable for applications where high power is required but where the tool also needs to be as compact and light as possible, e.g. angle grinders, circular saws, rotary hammers and (tophandle) chainsaws.