I know this isnt much help but...
Try to get your batts charged to 100% while running surfaced at night.
Only run at very slow speeds while submerged 2 or 3 knots will greatly extend your battery life.
Lastly I have been assigned missions to photo recon areas which a quick glance at the map will reveal itself to be suicidal at best. In that case I just go out and sink stuff and ignore the orders.
The patrol boats usually wont "find" you while submerged unless there very lucky. Chances are someone / something spotted you and called them in.
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