My 536 cable has a choke.But see my thread earlier. They aren't all exactly "just plain old mini USB cables." My 436 will not charge using the cable that came with the 536. That cable apparently doesn't provide enough current, and the 436 resets back to the "Charge?" immediately after it starts charging.
The 536 came with a cable that has no RF choke (the 436's cable has a choke) and that is slightly thinner than the 436 cable.