Life would be a lot simplier to get a modern type charger that is a balancing type charger in lipo mode. A good inexpensive one is available for ~$60. If your charger did not come with detailed instructions, its more dangerous than useful.

You need to add balance connection to your homemade lipo. You can get the connection here -

http://www.rcdude.com/servlet/the-Co...les/Categories


There are 4 different types in use to day, the JST-XH is most common. You'll find wiring diagrams for the balance wiring here - 3S is on page 3

http://www.allerc.com/Pictures/LBA10...Manual-ENG.pdf


It is important in using your lipo that you know what the individual cell voltages are so you can avoind overcharging and over discharging it. Either condition can lead to damage and is potentially unsafe.