The charger that comes with a radio system is fine for charging the transmitter battery as well as the receiver battery. Neither should be used to charge a 7.2 volt battery pack. The best charger to use to charge virtually any battery is one that charges at approximately 10 per cent of the battery's rated capacity (C/10). In other words, if the battery is rated at 1300mAH, then it should be charged at approximately 130mA. In the case of the battery supplied with the Albacore Deluxe Package (2700mA), I like the Radio Shack part #273-1767 which is rated at 300mA which is close enough to the ideal 10 per cent of 270mA.
But there's something else to keep in mind. As everyone probably knows, C/10 is considered overnight or about 12 hours. That's fine if the battery is fully discharged but not so fine if it's less than fully discharged. A battery that's only 50 per cent discharged will be very much overcharged if left connected to the charger for 12 hours, even if only at the C/10 rate. What to do? Simple. Monitor the battery voltage. Whether nicad or nickel-metal-hydride, I use 1.45 volts per cell when charging. With a 6 cell battery, that means terminate the charge at 8.7 volts.
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