Cycling means drawing the voltage down to preceisely 1.1 volts per cell, then fully recharging. That is one cycle, and is tough to do accurately without a "cycler".

The "Voltwatch" will help, but keep in mind, once the Rx pack's voltage hits 4.8 volts, then the voltage will fall off pretty quickly. As the pack gets older, I'd suggest recharging when it hits 5.0 volts.

You can also buy a "loaded" voltmeter, commonly called an ESC (Expanded Scale Voltmeter) at hobby shops for around $15. (But will require buying/making leads.) They'll give you a pretty accurate way to check voltage between flights.

Good luck,
Dennis-