One of our friends Jack from the Chinese A320 forums has found a hidden menu in the A320 firmware.
You can access it by scrolling along to System, Click into About to show you the disk usage and remaining memory, now press the following in order on the D-Pad
↑ → ↓ ↑ → ↓
You should now see a white screen detailing some info about the OS, RAM and Screen.
The last 6 digit number shows battery status. Full charge should be around 270000.