[TorpX]

Originally Posted by razark

It wasn't a mod. It was a flaw in the stock game that would very slowly recharge the battery without fuel usage.
It might have existed only in the pre-1.5 versions. It's been a long time since I've seen it mentioned.

I never bothered to test earlier versions, but in developing ISP, I played around with the batteries quite a bit, and it won't work with v1.5. You do need fuel to recharge batteries (thank God!).

What does happen is that when you submerge and run on the battery, it never quite gives out. It will, after much running, go down to 2%, then 1%, but never to zero. So, you could, in theory run submerged as long as you can, surface for some air, submerge and run again, over and over. It would be very slow, however. You can't go fast on a 1% battery level. Of course, it is a major physics flaw; the batteries are totally screwed up.

Personally, I would just start another career. You could consider that your commander went to the surface Navy, like many sub commanders did.