I am going away for 3 weeks. I dont have a smart charger that can discharge to a certain voltage as well, but I do have a voltmeter to measure the battery.
For a 3 cell lipo battery the recommended storage charge is 11.55 v (a 50% charge) kept at room temperature. The amount of actual charge can vary slightly, but stay close to 11.55 v.
Here's a link to an excellent write up on lipos. Everything and more than you ever wanted to know about lipo batteries .