Repair expert advises:
Using Neato Control program, log data in a file:
for the analysis, you need to run the getcharger command at a period of 1 second, turn off the testmode and put the robot on charge, you need a log record for at least 3 minutes. The log should be archived and not published in an open form - this clogs the forum and worsens readability.
There have been defective docks. One showed a momentary over-voltage in charging revealing defects.
When charging battery voltage is 1-2v higher than the disconnected battery, rising as the battery fills. 12v battery 10 NiMh cells, max 13+v.
Charging terminates when temperature rises faster than 1C/min. by thermistor, for NiMh chemistry in enclosed packs.