First off, thanks Alblaka for IC, it's awesome!
However, IC2 is slightly less awesome than IC1; batteries are a pain in the ass.
The batteries of IC1 was great (imo), easy to use, did what they were supposed to, I never experienced any hassle using them, ever... However, with IC2 and it's partially depleted batteries; functionality has been greatly reduced (which goes against the intended idea of improving, not ruining, the battery system).
When I start out on a new IC map, i usually just get a macerator, a generator, and then a crapton of solar panels, along with a nice stack of batteries which I can just leave in the solar panels, in stacks of 5-10, to have them recharged.
This, of course, is impossible with IC2, given it's partially-depleted batteries, whereas I have to manually take out and insert batteries when recharged (this becomes quite a hassle when having atleast 10 batteries).
It really does discourage me from playing -- I mean seriously... Try it, it's a pain.
Now, I wasn't sure if I should put this in suggestions or support, so I just took my chances and went with support... Considering the suggestions that have already been made to change generators, adding an additional slot for empty batteries that will be put in the refill-slot (and the filled battery goes to the chest).