A loaded volt meter will tell you if you have a full charge but you will need a battery cycler to tell you if your battery is is drawing down the mah. I just cycled my batteries and I had one that was a 4.8 volt 1450mah. It took a full charge but when I cycled it the battery would only draw 300mah. A good battery shouled draw at least 80% of it's rated mah. Mine wasn't good!! I tested it several times. Same thing every time. I'm having some new RX packs made up for me now. A good charger that will cycle is a must have item for good battery maintance.