Hi. I have a Superstar 40 with a Futaba T4VF 72MHz radio. The charger for the radio rx/tx is a simple transformer, and the tx has an analogue charge indicator. I have no idea how long to leavethe rx and txplugged in to charge the batteries. I also don't really know how long the batteries should last once charged. Up to now I've just been recharging them after each flight, and leaving them to charge overnight. Any advice would be appreciated, thanks.</p>