The nominal voltage for a lipo cell is 4.2V
I also believe there's a 477A capacitor
Now, the behaviour I'm was getting, which rather scared me was after usage the battery started increasing the voltage (at the begining was 4.1 but rose to 4.3)
Never hook things directly to Li chemistry batteries unless you are sure that each cell has its own protection circuitry.
Now that's advice that millions of people doing RC are ignoring with great success. If you look on the hobby sites like Hobbyking you won't find a Li-ion or Lipo battery that has any protection circuitry. You just need to be a little careful with them. You don't need to rely on electronics to do your thinking for you.Steve
So based on the circuit diagram in your first post, did you ever find out why the battery voltage was rising apparently on its own ?It does sound like the batteries are being subject to uncontrolled charging ...........