Given the 20 bucks for the real thing... I'd just call the chromebook is likely defective at this point. If you want, get the real charger and a new battery and hope that's it.
Hi all. I bought an asus c300m chromebook cheapish on ebay and it came without a charger, as described.
I figured I could just botch one together, so I found a plug that fitted the chromebook on an old charger, cut the wires and soldered it to a 19v 45w charger I had knocking about. I checked the voltage and polarity with a multimeter and as it looked fine, I plugged it it. The charging light on the side of the chromebook goes to a steady red, and the charging icon in the system tray says that it is charging. But after an hour, it is still on 5%, still saying 12 hours until charged. Is there something about laptop chargers I've missed in my attempt to bodge something together!