New, budget cells will false peak and perform poorly for the first few charges, but that charger is not really suitable for NiMh's, despite what the marketing bods will try and tell you.
If the cells are not warm to the touch after charging from cold (never charge a hot pack) that is a good indicator that they have false peaked. Just hit the charge button again, but keep an eye on the cell temp.
As Jimmy has said, the Tamiya connector is utter bobbins and you would be far better off with a Deans style plug as they are polarity protected and thus user (idiot
) proof.
Any decent model shop will be able to sell you Deans connectors,
including me.
