I have got hard case lipos and soft uncased lipos and I store then in my transmitter case in nice foam cutouts for each battery. I either charge on day or pre charge the night before racing. I always charge in lipo bag. Once used I will then put back on charger and use lipo storage mode which is set to 3.8v per cell.
I also inspect lipos for condition and any that lot doggie are better disposed off and replaced.
I have had lipos that are 3 years old and still punchy and charge properly through this method.
