Microsoft announced recently that Batch Low Priority VMs will be retired on 2025. If you have already created a pool on Azure Batch, it will be hard to find if this pools uses Low priority or Spot VMs.
Below you can find the detailed article that is provided from Microsoft about the migration.
Using Azure Spot Virtual Machines allows you to take advantage of Azure unused capacity at a significant cost savings.
In order to find out if your pool is using Spot OR Low priority VMs you will have to check the pool allocation mode. If the allocation mode is Batch service it means that it has been created with Low Priority VMs.
When creating a new pool with User subscription mode, this pool can take advantage of the Spot VMs.