How long does it take to charge a fully depleted battery?Martin GaffronMartin Gaffron5:25 amSeptember 26th, 2016 How long does it take to charge a fully depleted battery? To fully charge a completely depleted battery can take up to 8 hours. Tags:battery, Z1 0 How should I clean my Z1? What is the lifespan of the 45Wh battery module?