Hi there, I have this Bluetooth speaker that has a spare battery compartment, I bought a battery that fits the dimensions, but the plugs don't align and I need to widen the space for it to fit. To the point: the plugs on the speaker don't go to the + and - terminals of the battery (see photos) but to an outer one with no labeling that has 3.66v constant. The plugs on the Speaker output 3.95v, if I wire this up will it work? If so how will I do it? I assume there is a charge controller as it already has a 800mah battery in it.
This probably doesn't make sense, images to explain it better coming soon

 

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