batteries

So I was looking at my battery situation last night and I had a question: Each pack is 7.4 V. One of the packs protection circuit seems to be broken. I checked the individual batteries with my multimeter and I get 7.4V but when I check the voltage from the protection circuit I don't get...

I have been using these batteries for my portable. I also have been using this PCM. Could I just swap the batteries out for these ones to save space, or would I need a new PCM and charger and all? Thanks!