I made the conversion without problems (and I'm not very skilled) and the charger works very well. I don't have a voltmeter so cannot comment on whether it is charging the lipolys 100% but I am getting about 15 minutes flight time from the E-Tecs using the charger and am quite happy with that.
In addition, I picked up for $20 CAD an adapter from Radio Shack that lets you use your auto charger with a regular wall socket...so for a total of $35 CAD I have a lipoly charger that I can use and home and in the car.
The other thing that I really like about this auto charger is that, unlike the standard Birdseed charger, you can leave the batteries plugged in without worrying about over charging them.
I highly recommend this charger and Zebrahobby as I have always received excellent pricing and service from them.
Hope this helps.