The problem is simple: I have bought an UBEC, which should accept 7,6V from my battery and give me 5V to power my electronics. But the one I bought does not give me 5V, but 5.3V - that could cause trouble as I am going to power a Raspberry Pi as well, which could be damaged by this voltage...
So I tried using a diode to drop the voltage a bit. It did indeed, but I am having trouble finding a diode, that would drop it maximally for 0.5V at 3A, so that the drop is not too big (Raspberry Pi demands 4.75V - 5.25V, if I remember correctly and I'm planning on using more TTL electronics, like a webcam, which could be sensitive to input voltage as well).
The question is: Could I use more diodes in parallel to increase the maximum current and decrease the voltage drop or would this not work? I yes, could anyone recommend a good diode to use? I need to have maximum current at least 3A (for some motors and such).
I was thinking of using these: http://www.gme.cz/dokumentace/223/223-001/dsh.223-001.1.pdf