Short said, the Enterprise Edition (EE) is Samsung's business program and is therefore primarily aimed at companies and not private customers. The devices are therefore tailored to the needs of companies and can also be customized quite flexibly in terms of performance and costs.
1. 3100 mAh
2. yes, should have dual SIM.
3. memory is expandable, in addition to dual SIM.
4. if you want my opinion, don't buy it. There's much better for the price.
With an Enterprise Edition, Samsung guarantees you security updates for 4 years and offers various additional security features for the business sector (Samsung Knox security platform, E-FOTA...).
https://www.samsung.com/de/business/samsung-enterprise-edition/