Original batteries were two of 3.7V 53mAh 410920 lithium-ion.
Replacement batteries are two of 3.7V 80mAh 401119 lithium-polymer.
Both types of batteries are roughly 2cm x 1cm x 0.4cm
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The battery cover compartments separate by pulling them apart carefully perpendicular to the seam (each half directly away from the line of the wire). One battery has two wires: ground and positive. The other battery has three wires: ground, positive and negative. All in all pretty straight forward if you have the right tools, I recommend at least a magnifier or preferably microscope screen, and a good hot soldering iron.
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