I bought a replacement power adapter RAVPower ARTS65A-RA for my laptop Toshiba Satellite A105-S2712 a few months ago. It has been working perfectly since I bought it. The problem is when I use it to power another Acer laptop(I don't remember the model NO.), it worked fine at first but shut dowm afterwhile. The replacement adapter is 19V 3.42A. The original adapter for the Acer is 19V 4.74A. The tip is the same, so I give it a shot. It shouldn't be the adapter's problem since it works perfectly with my laptop. So what happened to the Acer laptop? Was it burned? But if it couldn't work with the Acer laptop, then why did it work at the first?