We need to know how much juice left in the internal battery pack.
So I bought this
11.1V Li-Ion Battery Status Indicator of ebay.
![](http://www.load64.com/up/bati.png)
I removed the LED lights and the top of the switch.I shorted the switch so it will always be lit.
![](http://www.load64.com/up/bati2.jpg)
I also bought
rectangular RGB LED's of ebay.
![](http://www.load64.com/up/bati3.jpg)
I soldered the LED to the indicator board.Added 330R resistor to the negative leg.
![](http://www.load64.com/up/bati4.jpg)
I added a connector to the +12V input of the voltage regulator for easy plug in.
![](http://www.load64.com/up/bati5.jpg)
It's ready to plugin.
![](http://www.load64.com/up/bati6.jpg)
Push it in where the original LED was.Perfect fit.
![](http://www.load64.com/up/bati7.jpg)
It turns red when low on power,green medium and blue is fully charged.
![](http://www.load64.com/up/bati8.jpg)