The battery of E1+  has a capacity of 5000 mAh, and it takes 7-8 hours to fully charge. It can last about 30 days in Timer mode. If you choose to use the Intelligent Mode, the use time of the fountain will vary depending on how often your pet drinks water, because it will adjust the working time of the water pump according to the frequency of your pet's drinking water to achieve the effect of saving power.