You are billed on a minute basis for using Batch Compute. If the resource is used for less than one minute, 1-minute resource usage is charged. The billing cycle is an hour. You are charged based on the virtual machine (VM) resources (core*hour) occupied by a cluster or job in an hour. Make sure your registered credit card is valid and does not have any credit limit set. Moreover, if you choose PayPal, you must maintain sufficient balance in your account. Otherwise, the service may be suspended due to outstanding payment.
The billing method is the same as that of the ECS spot instance. For more information, see ECS Spot instances.