Hi, I did the stupidest thing today. I charged a batterypack of 4 NiCds the wrong way, I put the negative to positive and positive to negative. Then I wondered why my R/C equpment didn't work. Then I measured the voltage and it showed -0.6v &: Are these bateries now gone for? Or will they work normally if i charge them again the right way? Will their capacity drop? or any other side effects?