If you're using multiple chargers and the battery still isn't charging, your best bet would be to go on Amazon and just get a new battery for the laptop. It's more than likely a dead battery that refuses to hold any sort of charge.
It's really either or. If it's lagging, it has a lot to do with your internet connection. From personal experience, my laptop started lagging once and then I reset my Wi-Fi modem, and then it was working back to normal!
I have the Toshiba Satellite c55d-a and I was just wondering how I can get it to stay on without it being plugged in? Every time I use it, it always has to be plugged into the charger, or else it won't turn on. Any ideas to fix that?