Cell terminal voltage will rebound a bit after use, your 7.65 volts indicates less than half capacity left....but how was it measured? I am not familiar with the CellPro chargers but understand they are a quality unit. The charger appears to have read a different terminal voltage than the other instrument did. If you charged the packs for 5 minutes and the remaining capacity was still 3%, I'd wonder about the accuracy of the charger. What was the charge rate for that 5 minutes?
While I use a Cellmeter-8 or a FlightPower balancer to give me an idea of the capacity left in a pack - what really matters is how much charge the pack takes to fill it. I always compare what the Cellmeter-8 says and what the charger puts back to check accuracy - they are usually very close. How much charge did your packs take? If they took over 5000 mAh then the 3% estimate of remaining charge is about right. If they took only 3500 mAh then the charger's estimate is suspect and I would use another method to determine the remaining charge in your packs.
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