Here's some information to add to the hopper. I have only plus batteries for the Mini 5 Pro, no standard batteries, so I couldn't directly check the results @GadgetGuy found.
But, I tried a Mini 4 Pro standard battery (with 249 gram marking) in...
But you also shouldn't go too slow.
There's a "goldilocks" speed in between that will get the best fuel economy.
Sport Mode will burn the battery faster and give less distance.
Fly too slow and you use too much battery power just fighting...
After a few false starts I finally got large waypoint grid surveys working on the Mavic 4 Pro. Litchi has a beta Hub that can output files you can put on the RC-2 Pro. Still Beta and it does have a few errors that crop up. The M4P is a bit tricky...