Take a look at an inductive power transfer mechanism.
Big advantage then is you don't need to punch holes in your case and it 
will probably work out cheaper than the magic contacts.

Stephen R Phillips wrote:
> I am in a project at my company in which we have reached an impasse
> with finding contacts for our project. The device is a hand held
> instrument with integral battery (IE rechargeable).  It is a SEALED
> unit and the battery is NOT user removable or replaceable (this is a
> requirement to meet government regulations so it's immutable).  This
> means the device requires case contacts AND also require contacts for
> charging the unit. It will be operated in a dirty and dusty environment
> therefore the contacts need to somehow be self cleaning etc.  The
> 'vision' that's been tossed about is to chuck the instrument into a
> unit with spring contacts that wipe (and therefore self clean).
> Contacts need to be gold for low contact pressure and have to have
> approximately 2.5mm to 5mm of travel (the more the better because the
> contacts are recessed again government regulated ) for the charging
> unit.
>
> I've seen similar contacts used on wireless mice etc. However there
> travel is quite limited.  Anyone have a clue?  We have a clue as to
> what we want we just don't want to become experts at making contacts
> (we already have more work than we can get done in time as it is) and
> have someone make 'our' design.  It would be nice if some one had
> expertise in this field so we can get the contacts made or off the
> shelf (preferably the latter).
>
> Stephen
>
>
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>   

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