another tip:
if you are not using the lipo for a long time (>1 month), you can use 'storage' mode to charge up your lipo. this way, you lipo will not swell up.
if your charger does not have storage mode, just charge it until each cell is about 3.8-3.9v, then stop.
Yes, if you full charge then let lipo sit for too ling without using, it will cause swollen and damage the battery (aka 肥仔電). So there is storage mode to put the right amount of capacity into the lipo.