There are hardly any Google results with that model number. This is one of the only results: https://forum.toshiba.eu/showthread...-C-15M-Win10-How-many-batteries-are-available Apparently you're not the only person to have issues like this. But no one responded to this person. I'm sorry that I can't be of any more help. I tried finding a tear down video of the keyboard base but I couldn't find one.