Laptop batteries are more likely to degrade over time due to continuous consumption. At some point in their lifespan, they might lose the capability of holding charges or may not last longer than before. Therefore, it would be great for you to use a hp envy m7-u109dx battery replacement in place of a defaulted or dead battery to bring back the life of your hp laptop.
Thus, you need to consult a professional laptop provider to gather the serial number of the battery and what type of battery can be used as a replacement. It will help you find the right battery replacement for your hp envy series laptop. While replacing the battery, you should use proper tools because replacing the battery is quite complicated, and proper tools will protect the laptop system from taking further damage.