Battery Recharge Parameters

[CrocodileDundee]

For a lot of time I've been blindly experimenting with the battery recharge function and I'm about to give up. I'm not yet sure how/where the battery recharge values are stored and/or how they're calculated.

I've been fooling around with eng_power in the boat .sim file. I've tried increasing/decreasing the diesel engine power, the electric motors power with inconclusive results. Been trying to look around in the *.sim files in SH5 too with Goblin, but I can't figure it out.

If ANYONE so far has figure it out, could you please post the following info:
1. what files need to be edited? (I personally looked at the submarine *.sim files, but I might be wrong). Someone said something in a battery thread about *.zon files. I can't see why, but please enlighten me if I'm wrong.
2. How recharge is calculated? I noticed that if I increase the battery cappacity (by extending the underwater range) the battery recharge slows down. So it has to be a fixed value somewhere. I've combed the *.sim files with HexEdit, then with Goblin, but I'm still in the dark.
3. What do eng_power (both for surface/E_propulsion) variables code? I figured that acceleration changes with different values of eng_power, and the boat speed too. The greater the power, the more fuel consumption as well. But my experimentation with these variabled did not change the battery recharge time conclusively. Maybe I'm missiong something here, or maybe I didn't tweak it enough?
4. I changed (in abilities.upc) the recharge rates for the motor officer, but I can't tell a significant change in the game. Even tried extreme values (from 10% to 100000%). Since all the other abilities work just fine, I'm wondering what's going on here?
5. Are there any upgrades further in the game concerning the batteries? I looked at 'upgrade packs.upc' but I can't find anything.

Many thanks in advance guys. It's been frustrating not being able to figure out on my own , but I reckon someone must have found these info. Any info on this matter is greatly appreciated!