I researched whether Makita Li batteries have built-in over-discharge protection. Makita was of no help in this. 18 V, 5 and 6 AH batteries produced since 2019 (maybe since 2017) have it. There’s a good video by Tool Scientist on the topic. See the link. If the current draw is above 5 A, the battery will shut off at about 12 V. Strangely, if current draw is under 5 A, shut off doesn’t occur until voltage drops to about 8.5 V, which is on the low side. Apparently, most tools draw 5 A or more. My rule has been that as soon as a tool starts to slow down, swap batteries, which has worked well.
Mike