Some of the PC Advisor laptop reviews indicate that battery life is 2 to 3 hours or more under their standard test conditions. Not sure how this relates to your personal use, but 45 minutes sounds much too little for a new battery.
Best Black Friday Deals 2017
How modern book design was influenced by illustrated manuscripts
Best Black Friday Apple Deals 2017
Les meilleurs logiciels de montage vidéo gratuits (en 2017)