Here's the actual rule regarding minimum safe altitudes for planes.
§ 91.119 Minimum safe altitudes: General.
Except when necessary for takeoff or landing, no person may operate an aircraft below the following altitudes:
(a) Anywhere. An...
The new battery is showing 75 charge cycles so it will have lost some of its original capacity.
Battery capacity data from the new battery is blank so I can't give any comparison numbers.
The cell voltage drop over time isn't alarming.
In DJI Go...
It's always easier with a short description of what happened or what you observed.
But here's what I make from the data.
It looks like you launched (without waiting for GPS or to have the drone record a home point) and climbed to about 15 feet...
If you do a short flight ... even just a few seconds and post the recorded data, I can dig deep in the data to find the actual capacity of the battery to compare with the 3850 mAh capacity of a new battery.