Multiple Akkupack base
Festool Symmetric 70+ mitre saw with a base that houses multiple Akkupacks.

Solution

Festool has already in its catalog a Compound Mitre Saw, the Symmetric 70, with and ingenious system for precise angle fixation. Therefore, I propose they develop a similar product with a larger blade, to cut wood strips of mm 140 x 25, with a battery operated motor. However, instead of placing the battery on the machine, supplement the saw with a base which connections for up to four Akkupacks. This would avoid adding weight to the saw and give it additional power or operating time.