Battery values are excellent, charging power seems to be flawless. I believe battery is innocent here and something is draining it beyond the acceptable..it might be a software or a hardware issue. To check what’s happening on software side, find activity monitor in utility folder inside applications folder. Launch it and select from menu to list “all processes” and see if there’s something using an unusual and unjustified amount of Cpu. Check what’s the average value of Cpu used during a normal session to see if anything is keeping it busy beyond the ordinary. If Cpu stays below 20% on average and battery gets drained at the speed you indicate something might be absorbing power on the hardware side.