After unpacking the unit....you see that the rechargeable battery pack slides inthe the Wii Remotes battery compartment with a snap and has a protruding part with the 4 metal contacts for the charging station.....this is why the use of the rubberized battery compartment covers is mandatory as the covers have the hole for access to the battery contacts.

Placing the controllers with everything installed into the charger initially worried me as I wasn't sure if I had to remove the Wrist Straps.
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