It probably did find some surface charge but considering your friend's battery was empty, even with the surface charge, the voltage of the battery when the charger was connected was more than likely below the 'FULL' level. Surface charge is a real YMMV as it will depend on the condition of the battery and the time between ending the charge and measuring the voltage as well. Example - if a battery was empty and then charged to 50%, the surface charge will still result in a voltage measurement that is higher than what it really is. So, in this example, 50% is approx 12.2V on a lead-acid battery so you may see 12.5V after 10 or 15 minutes after charging it to 50% and then a few hours later, you might see 12.3V and then a few more hours later you get down to 12.2V. Now if the battery was FULL (ie 12.7V), then you may see 13.0V 10 to 15 minutes after charging, and then it drops to 12.8V a few hours later and then down to 12.7V a few hours after that.CocoJambo wrote: ↑Nov 17th, 2018 9:10 pmNoco G7200 does not seem to be have regular surface voltage measuring analysis of state of charge..
Friends new van with all bells and whistles did not start one fine morning. he called CAA ...after 20 or so attempts ( guys booster pack was discharged lol) they managed to start the van...he drove to office approx 12 kms
I joined him while back from office... van started well...we drove to my place 7 kms ..I told him how to use noco... then he drove his home another 5 kms at 6 pm..
he put noco...he said it took up to 1 am in the night to charge the battery to 100%
I am sure after this much driving , noco would definitely have found surface voltage to be full but still charged the battery...
One thing to note however, even with all of that driving, the battery wasn't full as he needed another 8 hours of charging before the charger thought it was full.