It seems we have come to an impasse then. Your tests are inconclusive. When you began recharging the batteries, what was their charge? (0%, 5%, 10%?) Were you running on the snorkel? The average underwater cruise speed for the XXI was 6 knots, not 4. (I can, and will, find the source that states that) And as you pointed out, 2 knots can make a large difference. We need to know exactly the circumstances when you began your test so we can repeat it.
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Originally Posted by Beery
In fact it may agree with my point. There's nothing in there that says a 'full recharge'.
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This same logic could be used against you. I have not found a single source that states it could do a partial recharge in 5 to 6 hours. Also, if it is just a partial recharge, why not only charge for 2 or 3 hours? It could still run for atleast a day or two. And they wouldn't have to worry about enemy aircraft as much.