Inside a Nyko Power Pak+ There are 2 batteries inside the Nyko Power Pak+, one slightly smaller and fatter than the official nintendo battery. The other one is as wide as the base but is very flat. The batteries are connected in parallel. The shell is friction sealed, which leaves gaps that you can use to pry it open. Warning: Spoilers inside! I ordered some powermat recievers that were on sale, hopefully it will fit inside the Nyko Power Pak+. That way I can skip the Nyko recharging base all together.