Current or Voltage is the same 1.2 volts,, Capacity is higher, I think you can get up to 4500 mAh cells
I've used NimH in the past, they work just fine,,,, currently I have several NiCd cells taken from old 18 volt cordless drill packs, I use those in my glow driver, the packs usually go bad because one or two cells go bad,, the other 13 cells are still good
