I've been looking at the regulations here:
https://www.fia.com/system/files/doc...2026-02-27.pdf
The diagram on page C64 shows the limits and, while there is 9MJ recharge available per lap, the battery capacity available is only 4MJ. The actual capacity of the battery will be more than this as they don't last very long if they are cycled from 0 to 100%. If we assume they cycle the battery between 20% & 80% then the actual capacity of the battery will be around 6.7MJ.
They've got 4MJ capacity that they can discharge as much as they like but they can only put 9MJ back in per lap so the temptation is going to be to take 4MJ out and then try to top the battery up wherever they can before taking out what they've just put back until they reach the 9MJ charge limit.
I wonder, somewhat counter intuitively, if the solution is to reduce the 4MJ battery capacity limit. OK - there will be less energy to deploy so the cars will be slower but they'll spend less time recharging so we'll see less of the "clipping" modes that hamper straight line speed. It might make for closer racing without the hazardous speed differentials that are currently possible.