how long does a 4000 mah battery last

Introducing our latest power bank with a 4000mAh battery capacity, perfect for keeping your devices charged on the go. With this large capacity, you can expect extended usage time for your smartphone, tablet, or any other USB-powered device. The 4000mAh battery is designed to provide multiple charges for most smartphones, allowing you to stay connected and productive throughout the day without worrying about running out of battery. This power bank also features fast charging capability, ensuring that your devices are replenished quickly when you are in a rush. The compact and lightweight design makes it easy to carry in your pocket, purse, or bag, making it a great travel companion. With built-in safety features to protect against overcharging and short circuits, you can trust this power bank to keep your devices safe while delivering reliable charging power. Say goodbye to low battery anxiety and enjoy uninterrupted usage with our 4000mAh power bank.