Alternator/charging questions

No, it's 2.6 with the cables on and 4.6 with them off engine off. Charged the battery at 40 amps for 85 minutes and the battery showed 12.79 volts, but if you watched the meter, it was losing volts as I watched From 12.79 to 12.78 to12.77 to 12.76. any ideas?