Another way that is cheap and works well is to use the charger that comes with your radio system to charge the tx and rx batteries then plug it into an appliance timer to come on one hour a day. If you only fly one day a week it will charge your standard 700 mah battery just fine without over charging it.
If you want to spend a little money then get one of the Sirius chargers. They don't do lipos but you just plug in your battery and when they light starts to blink it is done.
Fred