might depend on if you mod or not....there are two mods below that change the battery consumption because calculation units were off in code or something.... its called SH3 Battery Mod v 1.1
Quote:
"Von Helsching reported that there was an error in the U-boat submerged ranges. The Ubisoft programmers had mistakenly converted the ranges from miles into kilometres internally, resulting in the submerged range being too large.
Unfortunately, it is very difficult to correct the necessary ‘U-boat.sim’ files, since there is one for each U-boat, and other mods have altered them too. Thus there is no simple fix.
The result is that you will now have to be a lot more careful with battery usage when submerged!"
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So, if realism is what you are after you might want to mod your batteries.
Stiebler Fix
http://www.subsim.com/radioroom/show...ght=SH3Battery
Von Helsching Fix
http://www.subsim.com/radioroom/show...ght=SH3Battery