The batteries in this mod are 4 times more energy dense than they logically should be. (The accumulator takes 5 batteries and has 5 megajoules of capacty. The batteries in this mod can hold 4 megajoules of energy when charged.)
But my issue is more with charged battery transportation.
With a stack size of 100, you can fit 2'000 batteries in one small container. So that's 8 gigajoules of energy. And 20 with the battery packs that are 2.5 times denser. In a cargo ship filled with battery containers, that's 640 gigajoules of energy for batteries. And 1'600 for battery packs.
For a dredging platform running at 4 megawatts that's 44.4- hours worth of power, or 111.1- hours worth with packs. Which is quite excessive for factorio's timescale...
If you don't containerize them, then that's only 8'000 batteries, or 32 gigajoules of energy, and 2.2 hours worth of dredging. Or 80 gj and 5.5 hours for battery packs. But given the screenshots on the mod page, I don't think you (Xorimuth) intended for charged batteries to be transported outside a container like this.
And for comparison, a tanker ship filled with high pressure steam has only 19.4 gigajoules (6gj for low pressure steam.) Which would run for 1.3472- hours at the same power level. (25 minutes for low pressure steam.) Which are much more in line with Factorio's time scale.
Of course you could use a tugboat with its 5 slots instead. But powering a large dredging platform for 2.7- or 6.94- hours from just a single tugboat visit is also pretty unreasonable...
I'd suggest reducing the stack size and energy density of the batteries. My suggestion for exact numbers would be 1 and 2.5 megajoules of energy for batteries and battery packs. And a stack size of 15. (300 in a container) Bringing a fully loaded ship down to 24 gigajoules of energy for batteries. And 60 gigajoules for battery packs. Which could power a dredging platform at 4 megawatts for 1.6- and 4.16- hours respectively. Which I think would also make battery packs feel like much more of an upgrade, along with being much more inline with factorio's timescale and making high pressure steam a bit more competitive.
On top of that, this change wouldn't require much to change in terms of existing builds. (Unless someone is using non-containerised batteries or tugboats.)
Each dredging platform went from needing 1 battery per second, to 4... Which is still easily handled by yellow belts and containerization machines. A few inserters would have to be swapped to fast inserters and maybe some red belts. But other than that, the boat just needs to leave port more often.
There's also the question of how this would affect trains. They would definitively need several more fuel slots, or preferably an override to the stack size in those existing slots. (Like the artillery wagon has with its shells. No clue if that is possible, but thought I'd mention it if it is possible!)
