Hello!
Thanks for the mod.
Is it possible to add a code for batteries, so that if the battery is connected to the network and charged, it shows a full charge (all green indicators)?

Heya,

There is no state for accumulators to show they are fully charged, nor empty. Looking through the Protoype data ,you can only change states for charging, charging and base state. https://lua-api.factorio.com/latest/types/ChargableGraphics.html
I hope this makes sense.

Cheers

Is it possible to do something like:
if the battery charge is 100%, then use this picture, if the battery charge is not 100%, then use another picture.
I'm not a modder, I'm just guessing and clarifying, is it possible to use such a trick if there is no standard option?

I'm sure you could put in a control lua to do it, but I feel at this point it's more of a base suggestion to mention to Wube in the Factorio Forum