Using many different battery chemistries and different size packs, which I have accumulated over the past year. I decided to go against Flecc`s advice and buy a Graupner Ultra Duo Plus 30 which can charge NiCd/NiMH/Li-Io/LiMn cells and lead acid batteries.
In the time I have owned the charger it has worked faultlessly, Cut-off for NiCad and NiMH cells is by the “Delta Peak" method which can be adjusted, by setting mine at 5mV it works well cutting the power at between 1.45 and 1.5 volts per cell, there’s also a timer as an extra safety.
The two line LCD screen simultaneously displays all relevant parameters, including charge current, charge time, capacity, battery voltage, ect. There`s Variable battery balancing programs with variable cycle interval (up to 10 times), charge current, discharge current, separate capacity value displays for each cycle (even after completion) ideal for conditioning new batteries or in my case checking s/h for capacity, It`s mainly used in the house off a P.S.U (power supply unit), I converted an old pc p.s.u by using the 12 volt 18 amp rail, but can be used by connecting to a car or caravan battery. This is perfect for camping holidays and the like when you’re away from the national power grid, It`s a great little charger that I wouldn’t be without.
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