That's a good tip to keep your contacts clean , but I wouldn't want to get electrical contact cleaner on the plastic of the tablet or the docking station. Think I would unplug the charger and shut down tablet and use a little fine scotch brite and a Q tip to wipe the contacts.
I installed a Android app "DEVICE INFO HW" It's originally from a developer Andrey Ethermov from St Petersburg Russia. I do make sure to shut and close Maxi Sys App in background before opening any aftermarket App that my MaxiSys Elite didn't originally come with installed and make sure these are exited and closed out in the background before clicking on the MaxiSys App again)
Device info HW displays my battery profile as 6750mAh . I'm not sure why the outside of battery says 15400mah. See this video I made , but skip to the 12 minute mark to see Device Info HW app part .
https://www.youtube.com/watch?v=uqpNPqIXbsQ&t=771s