how long does a 4000 mah battery last

Introducing our latest smartphone featuring a powerful 4000mAh battery that provides long-lasting performance. With this battery capacity, you can enjoy up to 12 hours of continuous usage on a single charge, ensuring that you stay connected and productive throughout the day. Whether you're streaming videos, playing games, or browsing the web, our 4000mAh battery will keep up with your demanding lifestyle. Plus, with advanced power-saving features, you can extend the battery life even further, giving you peace of mind when you're on the go. Say goodbye to constantly searching for a charging outlet and hello to uninterrupted usage with our 4000mAh battery. Stay powered up and ready for whatever the day brings with our reliable and long-lasting battery technology.