Here's a way you could do it. Hook up a multimeter to the battery terminals and have 3dsident running. Then take note of which unknown values the 3ds gives you and the voltage the multimeter gives you. Do this until the 3ds runs out and then you will have a list of which values correspond to...
The battery voltage is hilariously wrong. You seem to be using a scale that goes from 0 - 4.6v
4.6 volts is only the input voltage.
The lithium-ion battery is charged with a separate circuit within the 3ds. If the battery really was 4.6 volts it would have blown up on you.
A lithium ion cell...