it shouldn't false peak. it could be your batteries. if that's the case, increase the volt threshold. for nicads, i use 15 mv/cell. for nimh, i use 6 mv/cell. other than that, you shouldn't be false peaking. perhaps, your unit needs to be re-calibrated. my buddy purchased one that would give very high voltage readings at the completion of the charge. it wasn't charging the batteries to high, but the built-in volt meter was reading the battery voltages higher than what they actually were. the 16x9 is a very good charger. maybe you got one that might be defective, i'd send it back to have it checked out. but before that, try adjusting the volt thresholds to my suggestions, and if that doesn't work- send it back! i've charged old batteries and they never false peaked w/ this charger.