Hi Petr,
I think your chance of success is high.? The Yaesu-branded ones are more expensive because they can be.? NiMH batteries are not necessarily complicated to charge, but sellers of expensive chargers will try to obfuscate that to gain market share.? The part that is complicated is the lights that tell you if it's fully charged.? They have to light up when the charge current is low or zero and the battery is at its maximum charge voltage.? Some might sense that the rate of voltage increase with charge current rises.? That requires a circuit or a 1-USD computer chip.? If you don't need those lights, or can read a voltmeter, you can save some money.? Just make sure that the charge rate is not too high and that the end-of-charge voltage is correct.? Measure these the first time you use the charger.? If it's not right, then substitute a voltage regulated, constant current power supply for the wallwart power supply that came with your charger.? PCB buck converters with such limiting and regulation are available on the internet for a few USDs.
Cheers,
Halden VE7UTS
